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Finding the Fourth Proportional to 256.53, 384.69 and 91.95

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Solution

The fourth proportional to 256.53, 384.69 and 91.95 is: 137.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.53 : 384.69 = 91.95 : x
  2. Step 2: Convert to fraction form
    256.53/384.69 = 91.95/x
  3. Step 3: Cross multiply
    256.53x = 384.69 × 91.95
  4. Step 4: Simplify right side
    256.53x = 35,371.43
  5. Step 5: Solve for x
    x = 35,371.43/256.53
  6. Step 6: Final answer
    x = 137.89

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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.