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Finding the Fourth Proportional to 420,935.20, 631,402.80 and 420,935.20

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Solution

The fourth proportional to 420,935.20, 631,402.80 and 420,935.20 is: 631,402.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,935.20 : 631,402.80 = 420,935.20 : x
  2. Step 2: Convert to fraction form
    420,935.20/631,402.80 = 420,935.20/x
  3. Step 3: Cross multiply
    420,935.20x = 631,402.80 × 420,935.20
  4. Step 4: Simplify right side
    420,935.20x = 265,779,663,898.56
  5. Step 5: Solve for x
    x = 265,779,663,898.56/420,935.20
  6. Step 6: Final answer
    x = 631,402.80

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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.