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Finding the Fourth Proportional to 508,897.20, 763,345.80 and 287,713.20

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Solution

The fourth proportional to 508,897.20, 763,345.80 and 287,713.20 is: 431,569.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,897.20 : 763,345.80 = 287,713.20 : x
  2. Step 2: Convert to fraction form
    508,897.20/763,345.80 = 287,713.20/x
  3. Step 3: Cross multiply
    508,897.20x = 763,345.80 × 287,713.20
  4. Step 4: Simplify right side
    508,897.20x = 219,624,662,824.56
  5. Step 5: Solve for x
    x = 219,624,662,824.56/508,897.20
  6. Step 6: Final answer
    x = 431,569.80

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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.