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Finding the Fourth Proportional to 425.62, 638.38 and 117.50

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Solution

The fourth proportional to 425.62, 638.38 and 117.50 is: 176.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.62 : 638.38 = 117.50 : x
  2. Step 2: Convert to fraction form
    425.62/638.38 = 117.50/x
  3. Step 3: Cross multiply
    425.62x = 638.38 × 117.50
  4. Step 4: Simplify right side
    425.62x = 75,009.65
  5. Step 5: Solve for x
    x = 75,009.65/425.62
  6. Step 6: Final answer
    x = 176.24

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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.