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Finding the Fourth Proportional to 819,005.20, 1,228,507.80 and 606,428.80

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Solution

The fourth proportional to 819,005.20, 1,228,507.80 and 606,428.80 is: 909,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,005.20 : 1,228,507.80 = 606,428.80 : x
  2. Step 2: Convert to fraction form
    819,005.20/1,228,507.80 = 606,428.80/x
  3. Step 3: Cross multiply
    819,005.20x = 1,228,507.80 × 606,428.80
  4. Step 4: Simplify right side
    819,005.20x = 745,002,510,944.64
  5. Step 5: Solve for x
    x = 745,002,510,944.64/819,005.20
  6. Step 6: Final answer
    x = 909,643.20

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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.