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Finding the Fourth Proportional to 614.60, 921.10 and 545.80

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Solution

The fourth proportional to 614.60, 921.10 and 545.80 is: 817.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.60 : 921.10 = 545.80 : x
  2. Step 2: Convert to fraction form
    614.60/921.10 = 545.80/x
  3. Step 3: Cross multiply
    614.60x = 921.10 × 545.80
  4. Step 4: Simplify right side
    614.60x = 502,736.38
  5. Step 5: Solve for x
    x = 502,736.38/614.60
  6. Step 6: Final answer
    x = 817.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.