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Finding the Fourth Proportional to 916.92, 1,265.18 and 518.54

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Solution

The fourth proportional to 916.92, 1,265.18 and 518.54 is: 715.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.92 : 1,265.18 = 518.54 : x
  2. Step 2: Convert to fraction form
    916.92/1,265.18 = 518.54/x
  3. Step 3: Cross multiply
    916.92x = 1,265.18 × 518.54
  4. Step 4: Simplify right side
    916.92x = 656,046.44
  5. Step 5: Solve for x
    x = 656,046.44/916.92
  6. Step 6: Final answer
    x = 715.49

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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.