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Finding the Fourth Proportional to 112.74, 155.94 and 99.84

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Solution

The fourth proportional to 112.74, 155.94 and 99.84 is: 138.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.74 : 155.94 = 99.84 : x
  2. Step 2: Convert to fraction form
    112.74/155.94 = 99.84/x
  3. Step 3: Cross multiply
    112.74x = 155.94 × 99.84
  4. Step 4: Simplify right side
    112.74x = 15,569.05
  5. Step 5: Solve for x
    x = 15,569.05/112.74
  6. Step 6: Final answer
    x = 138.10

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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.