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Finding the Fourth Proportional to 916.73, 1,377.11 and 712.81

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Solution

The fourth proportional to 916.73, 1,377.11 and 712.81 is: 1,070.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.73 : 1,377.11 = 712.81 : x
  2. Step 2: Convert to fraction form
    916.73/1,377.11 = 712.81/x
  3. Step 3: Cross multiply
    916.73x = 1,377.11 × 712.81
  4. Step 4: Simplify right side
    916.73x = 981,616.12
  5. Step 5: Solve for x
    x = 981,616.12/916.73
  6. Step 6: Final answer
    x = 1,070.79

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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.