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Finding the Fourth Proportional to 653,106.80, 979,660.20 and 487,218.80

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Solution

The fourth proportional to 653,106.80, 979,660.20 and 487,218.80 is: 730,828.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    653,106.80 : 979,660.20 = 487,218.80 : x
  2. Step 2: Convert to fraction form
    653,106.80/979,660.20 = 487,218.80/x
  3. Step 3: Cross multiply
    653,106.80x = 979,660.20 × 487,218.80
  4. Step 4: Simplify right side
    653,106.80x = 477,308,867,051.76
  5. Step 5: Solve for x
    x = 477,308,867,051.76/653,106.80
  6. Step 6: Final answer
    x = 730,828.20

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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.