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Finding the Fourth Proportional to 916.31, 1,265.09 and 636.46

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Solution

The fourth proportional to 916.31, 1,265.09 and 636.46 is: 878.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.31 : 1,265.09 = 636.46 : x
  2. Step 2: Convert to fraction form
    916.31/1,265.09 = 636.46/x
  3. Step 3: Cross multiply
    916.31x = 1,265.09 × 636.46
  4. Step 4: Simplify right side
    916.31x = 805,172.84
  5. Step 5: Solve for x
    x = 805,172.84/916.31
  6. Step 6: Final answer
    x = 878.71

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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.