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Finding the Fourth Proportional to 256.87, 354.27 and 158.56

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Solution

The fourth proportional to 256.87, 354.27 and 158.56 is: 218.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.87 : 354.27 = 158.56 : x
  2. Step 2: Convert to fraction form
    256.87/354.27 = 158.56/x
  3. Step 3: Cross multiply
    256.87x = 354.27 × 158.56
  4. Step 4: Simplify right side
    256.87x = 56,172.76
  5. Step 5: Solve for x
    x = 56,172.76/256.87
  6. Step 6: Final answer
    x = 218.68

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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.