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Finding the Fourth Proportional to 1,222.61, 1,686.44 and 724.90

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Solution

The fourth proportional to 1,222.61, 1,686.44 and 724.90 is: 999.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.61 : 1,686.44 = 724.90 : x
  2. Step 2: Convert to fraction form
    1,222.61/1,686.44 = 724.90/x
  3. Step 3: Cross multiply
    1,222.61x = 1,686.44 × 724.90
  4. Step 4: Simplify right side
    1,222.61x = 1,222,497.95
  5. Step 5: Solve for x
    x = 1,222,497.95/1,222.61
  6. Step 6: Final answer
    x = 999.91

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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.