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Finding the Fourth Proportional to 256.57, 384.92 and 186.55

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Solution

The fourth proportional to 256.57, 384.92 and 186.55 is: 279.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.57 : 384.92 = 186.55 : x
  2. Step 2: Convert to fraction form
    256.57/384.92 = 186.55/x
  3. Step 3: Cross multiply
    256.57x = 384.92 × 186.55
  4. Step 4: Simplify right side
    256.57x = 71,806.86
  5. Step 5: Solve for x
    x = 71,806.86/256.57
  6. Step 6: Final answer
    x = 279.88

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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.