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Finding the Fourth Proportional to 618.80, 927.24 and 390.32

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Solution

The fourth proportional to 618.80, 927.24 and 390.32 is: 584.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.80 : 927.24 = 390.32 : x
  2. Step 2: Convert to fraction form
    618.80/927.24 = 390.32/x
  3. Step 3: Cross multiply
    618.80x = 927.24 × 390.32
  4. Step 4: Simplify right side
    618.80x = 361,920.32
  5. Step 5: Solve for x
    x = 361,920.32/618.80
  6. Step 6: Final answer
    x = 584.87

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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.