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Finding the Fourth Proportional to 1,239.95, 1,711.15 and 742.61

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Solution

The fourth proportional to 1,239.95, 1,711.15 and 742.61 is: 1,024.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.95 : 1,711.15 = 742.61 : x
  2. Step 2: Convert to fraction form
    1,239.95/1,711.15 = 742.61/x
  3. Step 3: Cross multiply
    1,239.95x = 1,711.15 × 742.61
  4. Step 4: Simplify right side
    1,239.95x = 1,270,717.10
  5. Step 5: Solve for x
    x = 1,270,717.10/1,239.95
  6. Step 6: Final answer
    x = 1,024.81

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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.