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Finding the Fourth Proportional to 98.60, 148.08 and 81.56

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Solution

The fourth proportional to 98.60, 148.08 and 81.56 is: 122.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.60 : 148.08 = 81.56 : x
  2. Step 2: Convert to fraction form
    98.60/148.08 = 81.56/x
  3. Step 3: Cross multiply
    98.60x = 148.08 × 81.56
  4. Step 4: Simplify right side
    98.60x = 12,077.40
  5. Step 5: Solve for x
    x = 12,077.40/98.60
  6. Step 6: Final answer
    x = 122.49

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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.