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Finding the Fourth Proportional to 425.27, 634.16 and 391.61

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Solution

The fourth proportional to 425.27, 634.16 and 391.61 is: 583.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.27 : 634.16 = 391.61 : x
  2. Step 2: Convert to fraction form
    425.27/634.16 = 391.61/x
  3. Step 3: Cross multiply
    425.27x = 634.16 × 391.61
  4. Step 4: Simplify right side
    425.27x = 248,343.40
  5. Step 5: Solve for x
    x = 248,343.40/425.27
  6. Step 6: Final answer
    x = 583.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.