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Finding the Fourth Proportional to 916.62, 1,265.31 and 637.26

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Solution

The fourth proportional to 916.62, 1,265.31 and 637.26 is: 879.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.62 : 1,265.31 = 637.26 : x
  2. Step 2: Convert to fraction form
    916.62/1,265.31 = 637.26/x
  3. Step 3: Cross multiply
    916.62x = 1,265.31 × 637.26
  4. Step 4: Simplify right side
    916.62x = 806,331.45
  5. Step 5: Solve for x
    x = 806,331.45/916.62
  6. Step 6: Final answer
    x = 879.68

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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.