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Finding the Fourth Proportional to 98.84, 147.67 and 86.69

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Solution

The fourth proportional to 98.84, 147.67 and 86.69 is: 129.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.84 : 147.67 = 86.69 : x
  2. Step 2: Convert to fraction form
    98.84/147.67 = 86.69/x
  3. Step 3: Cross multiply
    98.84x = 147.67 × 86.69
  4. Step 4: Simplify right side
    98.84x = 12,801.66
  5. Step 5: Solve for x
    x = 12,801.66/98.84
  6. Step 6: Final answer
    x = 129.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.