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Finding the Fourth Proportional to 617.26, 921.35 and 545.17

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Solution

The fourth proportional to 617.26, 921.35 and 545.17 is: 813.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.26 : 921.35 = 545.17 : x
  2. Step 2: Convert to fraction form
    617.26/921.35 = 545.17/x
  3. Step 3: Cross multiply
    617.26x = 921.35 × 545.17
  4. Step 4: Simplify right side
    617.26x = 502,292.38
  5. Step 5: Solve for x
    x = 502,292.38/617.26
  6. Step 6: Final answer
    x = 813.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.