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Finding the Fourth Proportional to 112.43, 155.15 and 63.32

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Solution

The fourth proportional to 112.43, 155.15 and 63.32 is: 87.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.43 : 155.15 = 63.32 : x
  2. Step 2: Convert to fraction form
    112.43/155.15 = 63.32/x
  3. Step 3: Cross multiply
    112.43x = 155.15 × 63.32
  4. Step 4: Simplify right side
    112.43x = 9,823.24
  5. Step 5: Solve for x
    x = 9,823.24/112.43
  6. Step 6: Final answer
    x = 87.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.