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Finding the Fourth Proportional to 813.49, 1,221.17 and 618.01

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Solution

The fourth proportional to 813.49, 1,221.17 and 618.01 is: 927.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.49 : 1,221.17 = 618.01 : x
  2. Step 2: Convert to fraction form
    813.49/1,221.17 = 618.01/x
  3. Step 3: Cross multiply
    813.49x = 1,221.17 × 618.01
  4. Step 4: Simplify right side
    813.49x = 754,695.27
  5. Step 5: Solve for x
    x = 754,695.27/813.49
  6. Step 6: Final answer
    x = 927.73

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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.