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Finding the Fourth Proportional to 402,424.80, 603,637.20 and 390,760.80

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Solution

The fourth proportional to 402,424.80, 603,637.20 and 390,760.80 is: 586,141.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,424.80 : 603,637.20 = 390,760.80 : x
  2. Step 2: Convert to fraction form
    402,424.80/603,637.20 = 390,760.80/x
  3. Step 3: Cross multiply
    402,424.80x = 603,637.20 × 390,760.80
  4. Step 4: Simplify right side
    402,424.80x = 235,877,755,181.76
  5. Step 5: Solve for x
    x = 235,877,755,181.76/402,424.80
  6. Step 6: Final answer
    x = 586,141.20

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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.