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Finding the Fourth Proportional to 424,436.80, 636,662.16 and 143,961.28

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Solution

The fourth proportional to 424,436.80, 636,662.16 and 143,961.28 is: 215,944.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    424,436.80 : 636,662.16 = 143,961.28 : x
  2. Step 2: Convert to fraction form
    424,436.80/636,662.16 = 143,961.28/x
  3. Step 3: Cross multiply
    424,436.80x = 636,662.16 × 143,961.28
  4. Step 4: Simplify right side
    424,436.80x = 91,654,699,481.16
  5. Step 5: Solve for x
    x = 91,654,699,481.16/424,436.80
  6. Step 6: Final answer
    x = 215,944.28

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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.