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Finding the Fourth Proportional to 342.55, 513.78 and 126.08

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Solution

The fourth proportional to 342.55, 513.78 and 126.08 is: 189.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.55 : 513.78 = 126.08 : x
  2. Step 2: Convert to fraction form
    342.55/513.78 = 126.08/x
  3. Step 3: Cross multiply
    342.55x = 513.78 × 126.08
  4. Step 4: Simplify right side
    342.55x = 64,776.75
  5. Step 5: Solve for x
    x = 64,776.75/342.55
  6. Step 6: Final answer
    x = 189.10

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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.