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Finding the Fourth Proportional to 753.72, 1,039.61 and 691.75

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Solution

The fourth proportional to 753.72, 1,039.61 and 691.75 is: 954.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.72 : 1,039.61 = 691.75 : x
  2. Step 2: Convert to fraction form
    753.72/1,039.61 = 691.75/x
  3. Step 3: Cross multiply
    753.72x = 1,039.61 × 691.75
  4. Step 4: Simplify right side
    753.72x = 719,149.36
  5. Step 5: Solve for x
    x = 719,149.36/753.72
  6. Step 6: Final answer
    x = 954.14

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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.