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Finding the Fourth Proportional to 718.87, 1,077.12 and 691.90

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Solution

The fourth proportional to 718.87, 1,077.12 and 691.90 is: 1,036.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.87 : 1,077.12 = 691.90 : x
  2. Step 2: Convert to fraction form
    718.87/1,077.12 = 691.90/x
  3. Step 3: Cross multiply
    718.87x = 1,077.12 × 691.90
  4. Step 4: Simplify right side
    718.87x = 745,259.33
  5. Step 5: Solve for x
    x = 745,259.33/718.87
  6. Step 6: Final answer
    x = 1,036.71

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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.