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Finding the Fourth Proportional to 256.28, 383.90 and 140.66

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Solution

The fourth proportional to 256.28, 383.90 and 140.66 is: 210.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.28 : 383.90 = 140.66 : x
  2. Step 2: Convert to fraction form
    256.28/383.90 = 140.66/x
  3. Step 3: Cross multiply
    256.28x = 383.90 × 140.66
  4. Step 4: Simplify right side
    256.28x = 53,999.37
  5. Step 5: Solve for x
    x = 53,999.37/256.28
  6. Step 6: Final answer
    x = 210.70

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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.