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Finding the Fourth Proportional to 256.75, 384.79 and 117.88

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Solution

The fourth proportional to 256.75, 384.79 and 117.88 is: 176.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.75 : 384.79 = 117.88 : x
  2. Step 2: Convert to fraction form
    256.75/384.79 = 117.88/x
  3. Step 3: Cross multiply
    256.75x = 384.79 × 117.88
  4. Step 4: Simplify right side
    256.75x = 45,357.21
  5. Step 5: Solve for x
    x = 45,357.21/256.75
  6. Step 6: Final answer
    x = 176.66

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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.