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Finding the Fourth Proportional to 424,438.80, 636,665.16 and 143,963.28

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Solution

The fourth proportional to 424,438.80, 636,665.16 and 143,963.28 is: 215,947.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    424,438.80 : 636,665.16 = 143,963.28 : x
  2. Step 2: Convert to fraction form
    424,438.80/636,665.16 = 143,963.28/x
  3. Step 3: Cross multiply
    424,438.80x = 636,665.16 × 143,963.28
  4. Step 4: Simplify right side
    424,438.80x = 91,656,404,695.32
  5. Step 5: Solve for x
    x = 91,656,404,695.32/424,438.80
  6. Step 6: Final answer
    x = 215,947.28

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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.