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Finding the Fourth Proportional to 416.28, 624.47 and 138.61

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Solution

The fourth proportional to 416.28, 624.47 and 138.61 is: 207.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.28 : 624.47 = 138.61 : x
  2. Step 2: Convert to fraction form
    416.28/624.47 = 138.61/x
  3. Step 3: Cross multiply
    416.28x = 624.47 × 138.61
  4. Step 4: Simplify right side
    416.28x = 86,557.79
  5. Step 5: Solve for x
    x = 86,557.79/416.28
  6. Step 6: Final answer
    x = 207.93

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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.