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Finding the Fourth Proportional to 1,221.62, 1,685.42 and 724.42

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Solution

The fourth proportional to 1,221.62, 1,685.42 and 724.42 is: 999.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.62 : 1,685.42 = 724.42 : x
  2. Step 2: Convert to fraction form
    1,221.62/1,685.42 = 724.42/x
  3. Step 3: Cross multiply
    1,221.62x = 1,685.42 × 724.42
  4. Step 4: Simplify right side
    1,221.62x = 1,220,951.96
  5. Step 5: Solve for x
    x = 1,220,951.96/1,221.62
  6. Step 6: Final answer
    x = 999.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.