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Finding the Fourth Proportional to 342.74, 513.95 and 111.56

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Solution

The fourth proportional to 342.74, 513.95 and 111.56 is: 167.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.74 : 513.95 = 111.56 : x
  2. Step 2: Convert to fraction form
    342.74/513.95 = 111.56/x
  3. Step 3: Cross multiply
    342.74x = 513.95 × 111.56
  4. Step 4: Simplify right side
    342.74x = 57,336.26
  5. Step 5: Solve for x
    x = 57,336.26/342.74
  6. Step 6: Final answer
    x = 167.29

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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.