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Finding the Fourth Proportional to 256.55, 384.69 and 126.56

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Solution

The fourth proportional to 256.55, 384.69 and 126.56 is: 189.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.55 : 384.69 = 126.56 : x
  2. Step 2: Convert to fraction form
    256.55/384.69 = 126.56/x
  3. Step 3: Cross multiply
    256.55x = 384.69 × 126.56
  4. Step 4: Simplify right side
    256.55x = 48,686.37
  5. Step 5: Solve for x
    x = 48,686.37/256.55
  6. Step 6: Final answer
    x = 189.77

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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.