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Finding the Fourth Proportional to 342.34, 472.25 and 280.42

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Solution

The fourth proportional to 342.34, 472.25 and 280.42 is: 386.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.34 : 472.25 = 280.42 : x
  2. Step 2: Convert to fraction form
    342.34/472.25 = 280.42/x
  3. Step 3: Cross multiply
    342.34x = 472.25 × 280.42
  4. Step 4: Simplify right side
    342.34x = 132,427.87
  5. Step 5: Solve for x
    x = 132,427.87/342.34
  6. Step 6: Final answer
    x = 386.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.