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Finding the Fourth Proportional to 916.25, 1,264.50 and 517.95

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Solution

The fourth proportional to 916.25, 1,264.50 and 517.95 is: 714.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.25 : 1,264.50 = 517.95 : x
  2. Step 2: Convert to fraction form
    916.25/1,264.50 = 517.95/x
  3. Step 3: Cross multiply
    916.25x = 1,264.50 × 517.95
  4. Step 4: Simplify right side
    916.25x = 654,947.78
  5. Step 5: Solve for x
    x = 654,947.78/916.25
  6. Step 6: Final answer
    x = 714.82

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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.