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Finding the Fourth Proportional to 98.85, 147.89 and 85.03

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Solution

The fourth proportional to 98.85, 147.89 and 85.03 is: 127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.85 : 147.89 = 85.03 : x
  2. Step 2: Convert to fraction form
    98.85/147.89 = 85.03/x
  3. Step 3: Cross multiply
    98.85x = 147.89 × 85.03
  4. Step 4: Simplify right side
    98.85x = 12,575.09
  5. Step 5: Solve for x
    x = 12,575.09/98.85
  6. Step 6: Final answer
    x = 127.21

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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.