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Finding the Fourth Proportional to 98.61, 147.69 and 66

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Solution

The fourth proportional to 98.61, 147.69 and 66 is: 98.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.61 : 147.69 = 66 : x
  2. Step 2: Convert to fraction form
    98.61/147.69 = 66/x
  3. Step 3: Cross multiply
    98.61x = 147.69 × 66
  4. Step 4: Simplify right side
    98.61x = 9,747.54
  5. Step 5: Solve for x
    x = 9,747.54/98.61
  6. Step 6: Final answer
    x = 98.85

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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.