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Finding the Fourth Proportional to 402,121.20, 602,490.60 and 261,807.60

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Solution

The fourth proportional to 402,121.20, 602,490.60 and 261,807.60 is: 392,261.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,121.20 : 602,490.60 = 261,807.60 : x
  2. Step 2: Convert to fraction form
    402,121.20/602,490.60 = 261,807.60/x
  3. Step 3: Cross multiply
    402,121.20x = 602,490.60 × 261,807.60
  4. Step 4: Simplify right side
    402,121.20x = 157,736,618,008.56
  5. Step 5: Solve for x
    x = 157,736,618,008.56/402,121.20
  6. Step 6: Final answer
    x = 392,261.38

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.