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Finding the Fourth Proportional to 98.95, 148.61 and 85.96

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Solution

The fourth proportional to 98.95, 148.61 and 85.96 is: 129.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.95 : 148.61 = 85.96 : x
  2. Step 2: Convert to fraction form
    98.95/148.61 = 85.96/x
  3. Step 3: Cross multiply
    98.95x = 148.61 × 85.96
  4. Step 4: Simplify right side
    98.95x = 12,773.77
  5. Step 5: Solve for x
    x = 12,773.77/98.95
  6. Step 6: Final answer
    x = 129.09

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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.