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Finding the Fourth Proportional to 98.46, 147.67 and 57.86

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Solution

The fourth proportional to 98.46, 147.67 and 57.86 is: 86.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.46 : 147.67 = 57.86 : x
  2. Step 2: Convert to fraction form
    98.46/147.67 = 57.86/x
  3. Step 3: Cross multiply
    98.46x = 147.67 × 57.86
  4. Step 4: Simplify right side
    98.46x = 8,543.90
  5. Step 5: Solve for x
    x = 8,543.90/98.46
  6. Step 6: Final answer
    x = 86.78

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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.