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Finding the Fourth Proportional to 256.60, 384.85 and 83.39

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Solution

The fourth proportional to 256.60, 384.85 and 83.39 is: 125.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.60 : 384.85 = 83.39 : x
  2. Step 2: Convert to fraction form
    256.60/384.85 = 83.39/x
  3. Step 3: Cross multiply
    256.60x = 384.85 × 83.39
  4. Step 4: Simplify right side
    256.60x = 32,091.90
  5. Step 5: Solve for x
    x = 32,091.90/256.60
  6. Step 6: Final answer
    x = 125.07

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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.