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Finding the Fourth Proportional to 256.78, 354.32 and 158.51

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Solution

The fourth proportional to 256.78, 354.32 and 158.51 is: 218.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.78 : 354.32 = 158.51 : x
  2. Step 2: Convert to fraction form
    256.78/354.32 = 158.51/x
  3. Step 3: Cross multiply
    256.78x = 354.32 × 158.51
  4. Step 4: Simplify right side
    256.78x = 56,160.70
  5. Step 5: Solve for x
    x = 56,160.70/256.78
  6. Step 6: Final answer
    x = 218.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.