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Finding the Fourth Proportional to 342.66, 513.90 and 99.21

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Solution

The fourth proportional to 342.66, 513.90 and 99.21 is: 148.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.66 : 513.90 = 99.21 : x
  2. Step 2: Convert to fraction form
    342.66/513.90 = 99.21/x
  3. Step 3: Cross multiply
    342.66x = 513.90 × 99.21
  4. Step 4: Simplify right side
    342.66x = 50,984.02
  5. Step 5: Solve for x
    x = 50,984.02/342.66
  6. Step 6: Final answer
    x = 148.79

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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.