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Finding the Fourth Proportional to 342.28, 513.41 and 98.80

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Solution

The fourth proportional to 342.28, 513.41 and 98.80 is: 148.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.28 : 513.41 = 98.80 : x
  2. Step 2: Convert to fraction form
    342.28/513.41 = 98.80/x
  3. Step 3: Cross multiply
    342.28x = 513.41 × 98.80
  4. Step 4: Simplify right side
    342.28x = 50,724.91
  5. Step 5: Solve for x
    x = 50,724.91/342.28
  6. Step 6: Final answer
    x = 148.20

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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.