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Finding the Fourth Proportional to 342.15, 513.09 and 98.61

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Solution

The fourth proportional to 342.15, 513.09 and 98.61 is: 147.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.15 : 513.09 = 98.61 : x
  2. Step 2: Convert to fraction form
    342.15/513.09 = 98.61/x
  3. Step 3: Cross multiply
    342.15x = 513.09 × 98.61
  4. Step 4: Simplify right side
    342.15x = 50,595.80
  5. Step 5: Solve for x
    x = 50,595.80/342.15
  6. Step 6: Final answer
    x = 147.88

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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.