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Finding the Fourth Proportional to 112.85, 155.69 and 99.03

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Solution

The fourth proportional to 112.85, 155.69 and 99.03 is: 136.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.85 : 155.69 = 99.03 : x
  2. Step 2: Convert to fraction form
    112.85/155.69 = 99.03/x
  3. Step 3: Cross multiply
    112.85x = 155.69 × 99.03
  4. Step 4: Simplify right side
    112.85x = 15,417.49
  5. Step 5: Solve for x
    x = 15,417.49/112.85
  6. Step 6: Final answer
    x = 136.63

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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.