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Finding the Fourth Proportional to 628,907.20, 943,360.80 and 313,979.20

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Solution

The fourth proportional to 628,907.20, 943,360.80 and 313,979.20 is: 470,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,907.20 : 943,360.80 = 313,979.20 : x
  2. Step 2: Convert to fraction form
    628,907.20/943,360.80 = 313,979.20/x
  3. Step 3: Cross multiply
    628,907.20x = 943,360.80 × 313,979.20
  4. Step 4: Simplify right side
    628,907.20x = 296,195,669,295.36
  5. Step 5: Solve for x
    x = 296,195,669,295.36/628,907.20
  6. Step 6: Final answer
    x = 470,968.80

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.