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Finding the Fourth Proportional to 256.38, 384.60 and 91.87

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Solution

The fourth proportional to 256.38, 384.60 and 91.87 is: 137.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.38 : 384.60 = 91.87 : x
  2. Step 2: Convert to fraction form
    256.38/384.60 = 91.87/x
  3. Step 3: Cross multiply
    256.38x = 384.60 × 91.87
  4. Step 4: Simplify right side
    256.38x = 35,332.59
  5. Step 5: Solve for x
    x = 35,332.59/256.38
  6. Step 6: Final answer
    x = 137.82

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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.