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Finding the Fourth Proportional to 100.85, 150.90 and 97.88

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Solution

The fourth proportional to 100.85, 150.90 and 97.88 is: 146.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.85 : 150.90 = 97.88 : x
  2. Step 2: Convert to fraction form
    100.85/150.90 = 97.88/x
  3. Step 3: Cross multiply
    100.85x = 150.90 × 97.88
  4. Step 4: Simplify right side
    100.85x = 14,768.97
  5. Step 5: Solve for x
    x = 14,768.97/100.85
  6. Step 6: Final answer
    x = 146.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.