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Finding the Fourth Proportional to 916.86, 1,265.30 and 518.68

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Solution

The fourth proportional to 916.86, 1,265.30 and 518.68 is: 715.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.86 : 1,265.30 = 518.68 : x
  2. Step 2: Convert to fraction form
    916.86/1,265.30 = 518.68/x
  3. Step 3: Cross multiply
    916.86x = 1,265.30 × 518.68
  4. Step 4: Simplify right side
    916.86x = 656,285.80
  5. Step 5: Solve for x
    x = 656,285.80/916.86
  6. Step 6: Final answer
    x = 715.80

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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.