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Finding the Fourth Proportional to 342.25, 512.38 and 260.31

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Solution

The fourth proportional to 342.25, 512.38 and 260.31 is: 389.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.25 : 512.38 = 260.31 : x
  2. Step 2: Convert to fraction form
    342.25/512.38 = 260.31/x
  3. Step 3: Cross multiply
    342.25x = 512.38 × 260.31
  4. Step 4: Simplify right side
    342.25x = 133,378.42
  5. Step 5: Solve for x
    x = 133,378.42/342.25
  6. Step 6: Final answer
    x = 389.71

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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.