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Finding the Fourth Proportional to 112.81, 155.50 and 103.87

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Solution

The fourth proportional to 112.81, 155.50 and 103.87 is: 143.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.81 : 155.50 = 103.87 : x
  2. Step 2: Convert to fraction form
    112.81/155.50 = 103.87/x
  3. Step 3: Cross multiply
    112.81x = 155.50 × 103.87
  4. Step 4: Simplify right side
    112.81x = 16,151.79
  5. Step 5: Solve for x
    x = 16,151.79/112.81
  6. Step 6: Final answer
    x = 143.18

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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.