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Finding the Fourth Proportional to 618.30, 927.45 and 515.70

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Solution

The fourth proportional to 618.30, 927.45 and 515.70 is: 773.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.30 : 927.45 = 515.70 : x
  2. Step 2: Convert to fraction form
    618.30/927.45 = 515.70/x
  3. Step 3: Cross multiply
    618.30x = 927.45 × 515.70
  4. Step 4: Simplify right side
    618.30x = 478,285.97
  5. Step 5: Solve for x
    x = 478,285.97/618.30
  6. Step 6: Final answer
    x = 773.55

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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.