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Finding the Fourth Proportional to 425.81, 638.71 and 117.66

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Solution

The fourth proportional to 425.81, 638.71 and 117.66 is: 176.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.81 : 638.71 = 117.66 : x
  2. Step 2: Convert to fraction form
    425.81/638.71 = 117.66/x
  3. Step 3: Cross multiply
    425.81x = 638.71 × 117.66
  4. Step 4: Simplify right side
    425.81x = 75,150.62
  5. Step 5: Solve for x
    x = 75,150.62/425.81
  6. Step 6: Final answer
    x = 176.49

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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.