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Finding the Fourth Proportional to 342.18, 513.28 and 98.74

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Solution

The fourth proportional to 342.18, 513.28 and 98.74 is: 148.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.18 : 513.28 = 98.74 : x
  2. Step 2: Convert to fraction form
    342.18/513.28 = 98.74/x
  3. Step 3: Cross multiply
    342.18x = 513.28 × 98.74
  4. Step 4: Simplify right side
    342.18x = 50,681.27
  5. Step 5: Solve for x
    x = 50,681.27/342.18
  6. Step 6: Final answer
    x = 148.11

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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.