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Finding the Fourth Proportional to 256.79, 384.92 and 126.71

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Solution

The fourth proportional to 256.79, 384.92 and 126.71 is: 189.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.79 : 384.92 = 126.71 : x
  2. Step 2: Convert to fraction form
    256.79/384.92 = 126.71/x
  3. Step 3: Cross multiply
    256.79x = 384.92 × 126.71
  4. Step 4: Simplify right side
    256.79x = 48,770.66
  5. Step 5: Solve for x
    x = 48,770.66/256.79
  6. Step 6: Final answer
    x = 189.93

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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.