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Finding the Fourth Proportional to 98.76, 148.12 and 66.90

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Solution

The fourth proportional to 98.76, 148.12 and 66.90 is: 100.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.76 : 148.12 = 66.90 : x
  2. Step 2: Convert to fraction form
    98.76/148.12 = 66.90/x
  3. Step 3: Cross multiply
    98.76x = 148.12 × 66.90
  4. Step 4: Simplify right side
    98.76x = 9,909.23
  5. Step 5: Solve for x
    x = 9,909.23/98.76
  6. Step 6: Final answer
    x = 100.34

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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.