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Finding the Fourth Proportional to 618.50, 925.57 and 387.50

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Solution

The fourth proportional to 618.50, 925.57 and 387.50 is: 579.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.50 : 925.57 = 387.50 : x
  2. Step 2: Convert to fraction form
    618.50/925.57 = 387.50/x
  3. Step 3: Cross multiply
    618.50x = 925.57 × 387.50
  4. Step 4: Simplify right side
    618.50x = 358,658.38
  5. Step 5: Solve for x
    x = 358,658.38/618.50
  6. Step 6: Final answer
    x = 579.88

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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.