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Finding the Fourth Proportional to 1,222.32, 1,686.26 and 724.98

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Solution

The fourth proportional to 1,222.32, 1,686.26 and 724.98 is: 1,000.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.32 : 1,686.26 = 724.98 : x
  2. Step 2: Convert to fraction form
    1,222.32/1,686.26 = 724.98/x
  3. Step 3: Cross multiply
    1,222.32x = 1,686.26 × 724.98
  4. Step 4: Simplify right side
    1,222.32x = 1,222,501.15
  5. Step 5: Solve for x
    x = 1,222,501.15/1,222.32
  6. Step 6: Final answer
    x = 1,000.15

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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.