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Finding the Fourth Proportional to 98.13, 147.30 and 86.79

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Solution

The fourth proportional to 98.13, 147.30 and 86.79 is: 130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.13 : 147.30 = 86.79 : x
  2. Step 2: Convert to fraction form
    98.13/147.30 = 86.79/x
  3. Step 3: Cross multiply
    98.13x = 147.30 × 86.79
  4. Step 4: Simplify right side
    98.13x = 12,784.17
  5. Step 5: Solve for x
    x = 12,784.17/98.13
  6. Step 6: Final answer
    x = 130.28

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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.