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Finding the Fourth Proportional to 425.66, 638.40 and 281.48

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Solution

The fourth proportional to 425.66, 638.40 and 281.48 is: 422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.66 : 638.40 = 281.48 : x
  2. Step 2: Convert to fraction form
    425.66/638.40 = 281.48/x
  3. Step 3: Cross multiply
    425.66x = 638.40 × 281.48
  4. Step 4: Simplify right side
    425.66x = 179,696.83
  5. Step 5: Solve for x
    x = 179,696.83/425.66
  6. Step 6: Final answer
    x = 422.16

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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.