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Finding the Fourth Proportional to 112.42, 155.18 and 98.62

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Solution

The fourth proportional to 112.42, 155.18 and 98.62 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.42 : 155.18 = 98.62 : x
  2. Step 2: Convert to fraction form
    112.42/155.18 = 98.62/x
  3. Step 3: Cross multiply
    112.42x = 155.18 × 98.62
  4. Step 4: Simplify right side
    112.42x = 15,303.85
  5. Step 5: Solve for x
    x = 15,303.85/112.42
  6. Step 6: Final answer
    x = 136.13

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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.