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Finding the Fourth Proportional to 112.75, 155.69 and 74.01

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Solution

The fourth proportional to 112.75, 155.69 and 74.01 is: 102.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.75 : 155.69 = 74.01 : x
  2. Step 2: Convert to fraction form
    112.75/155.69 = 74.01/x
  3. Step 3: Cross multiply
    112.75x = 155.69 × 74.01
  4. Step 4: Simplify right side
    112.75x = 11,522.62
  5. Step 5: Solve for x
    x = 11,522.62/112.75
  6. Step 6: Final answer
    x = 102.20

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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.