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Finding the Fourth Proportional to 916.90, 1,265.32 and 497.26

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Solution

The fourth proportional to 916.90, 1,265.32 and 497.26 is: 686.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.90 : 1,265.32 = 497.26 : x
  2. Step 2: Convert to fraction form
    916.90/1,265.32 = 497.26/x
  3. Step 3: Cross multiply
    916.90x = 1,265.32 × 497.26
  4. Step 4: Simplify right side
    916.90x = 629,193.02
  5. Step 5: Solve for x
    x = 629,193.02/916.90
  6. Step 6: Final answer
    x = 686.22

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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.