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Finding the Fourth Proportional to 616.78, 925.71 and 400.60

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Solution

The fourth proportional to 616.78, 925.71 and 400.60 is: 601.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.78 : 925.71 = 400.60 : x
  2. Step 2: Convert to fraction form
    616.78/925.71 = 400.60/x
  3. Step 3: Cross multiply
    616.78x = 925.71 × 400.60
  4. Step 4: Simplify right side
    616.78x = 370,839.43
  5. Step 5: Solve for x
    x = 370,839.43/616.78
  6. Step 6: Final answer
    x = 601.25

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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.