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Finding the Fourth Proportional to 721.86, 1,081.35 and 711.69

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Solution

The fourth proportional to 721.86, 1,081.35 and 711.69 is: 1,066.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.86 : 1,081.35 = 711.69 : x
  2. Step 2: Convert to fraction form
    721.86/1,081.35 = 711.69/x
  3. Step 3: Cross multiply
    721.86x = 1,081.35 × 711.69
  4. Step 4: Simplify right side
    721.86x = 769,581.93
  5. Step 5: Solve for x
    x = 769,581.93/721.86
  6. Step 6: Final answer
    x = 1,066.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.