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Finding the Fourth Proportional to 1,077.61, 1,487.72 and 724.17

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Solution

The fourth proportional to 1,077.61, 1,487.72 and 724.17 is: 999.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.61 : 1,487.72 = 724.17 : x
  2. Step 2: Convert to fraction form
    1,077.61/1,487.72 = 724.17/x
  3. Step 3: Cross multiply
    1,077.61x = 1,487.72 × 724.17
  4. Step 4: Simplify right side
    1,077.61x = 1,077,351.13
  5. Step 5: Solve for x
    x = 1,077,351.13/1,077.61
  6. Step 6: Final answer
    x = 999.76

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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.