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Finding the Fourth Proportional to 98.43, 147.57 and 67.89

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Solution

The fourth proportional to 98.43, 147.57 and 67.89 is: 101.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.43 : 147.57 = 67.89 : x
  2. Step 2: Convert to fraction form
    98.43/147.57 = 67.89/x
  3. Step 3: Cross multiply
    98.43x = 147.57 × 67.89
  4. Step 4: Simplify right side
    98.43x = 10,018.53
  5. Step 5: Solve for x
    x = 10,018.53/98.43
  6. Step 6: Final answer
    x = 101.78

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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.