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Finding the Fourth Proportional to 112.61, 155.04 and 97.82

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Solution

The fourth proportional to 112.61, 155.04 and 97.82 is: 134.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.61 : 155.04 = 97.82 : x
  2. Step 2: Convert to fraction form
    112.61/155.04 = 97.82/x
  3. Step 3: Cross multiply
    112.61x = 155.04 × 97.82
  4. Step 4: Simplify right side
    112.61x = 15,165.24
  5. Step 5: Solve for x
    x = 15,165.24/112.61
  6. Step 6: Final answer
    x = 134.68

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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.