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Finding the Fourth Proportional to 916.75, 1,265.24 and 636.83

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Solution

The fourth proportional to 916.75, 1,265.24 and 636.83 is: 878.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.75 : 1,265.24 = 636.83 : x
  2. Step 2: Convert to fraction form
    916.75/1,265.24 = 636.83/x
  3. Step 3: Cross multiply
    916.75x = 1,265.24 × 636.83
  4. Step 4: Simplify right side
    916.75x = 805,733.28
  5. Step 5: Solve for x
    x = 805,733.28/916.75
  6. Step 6: Final answer
    x = 878.91

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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.