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Finding the Fourth Proportional to 342.45, 513.65 and 111.29

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Solution

The fourth proportional to 342.45, 513.65 and 111.29 is: 166.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.45 : 513.65 = 111.29 : x
  2. Step 2: Convert to fraction form
    342.45/513.65 = 111.29/x
  3. Step 3: Cross multiply
    342.45x = 513.65 × 111.29
  4. Step 4: Simplify right side
    342.45x = 57,160.98
  5. Step 5: Solve for x
    x = 57,160.98/342.45
  6. Step 6: Final answer
    x = 166.92

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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.