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Finding the Fourth Proportional to 1,222.42, 1,686.79 and 724.97

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Solution

The fourth proportional to 1,222.42, 1,686.79 and 724.97 is: 1,000.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.42 : 1,686.79 = 724.97 : x
  2. Step 2: Convert to fraction form
    1,222.42/1,686.79 = 724.97/x
  3. Step 3: Cross multiply
    1,222.42x = 1,686.79 × 724.97
  4. Step 4: Simplify right side
    1,222.42x = 1,222,865.24
  5. Step 5: Solve for x
    x = 1,222,865.24/1,222.42
  6. Step 6: Final answer
    x = 1,000.36

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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.