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Finding the Fourth Proportional to 98.53, 147.66 and 86.31

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Solution

The fourth proportional to 98.53, 147.66 and 86.31 is: 129.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.53 : 147.66 = 86.31 : x
  2. Step 2: Convert to fraction form
    98.53/147.66 = 86.31/x
  3. Step 3: Cross multiply
    98.53x = 147.66 × 86.31
  4. Step 4: Simplify right side
    98.53x = 12,744.53
  5. Step 5: Solve for x
    x = 12,744.53/98.53
  6. Step 6: Final answer
    x = 129.35

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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.