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Finding the Fourth Proportional to 916.87, 1,375.82 and 711.85

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Solution

The fourth proportional to 916.87, 1,375.82 and 711.85 is: 1,068.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.87 : 1,375.82 = 711.85 : x
  2. Step 2: Convert to fraction form
    916.87/1,375.82 = 711.85/x
  3. Step 3: Cross multiply
    916.87x = 1,375.82 × 711.85
  4. Step 4: Simplify right side
    916.87x = 979,373.91
  5. Step 5: Solve for x
    x = 979,373.91/916.87
  6. Step 6: Final answer
    x = 1,068.17

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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.