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Finding the Fourth Proportional to 98.26, 148.15 and 86.38

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Solution

The fourth proportional to 98.26, 148.15 and 86.38 is: 130.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.26 : 148.15 = 86.38 : x
  2. Step 2: Convert to fraction form
    98.26/148.15 = 86.38/x
  3. Step 3: Cross multiply
    98.26x = 148.15 × 86.38
  4. Step 4: Simplify right side
    98.26x = 12,797.20
  5. Step 5: Solve for x
    x = 12,797.20/98.26
  6. Step 6: Final answer
    x = 130.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.