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Finding the Fourth Proportional to 256.20, 353.37 and 156.57

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Solution

The fourth proportional to 256.20, 353.37 and 156.57 is: 215.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.20 : 353.37 = 156.57 : x
  2. Step 2: Convert to fraction form
    256.20/353.37 = 156.57/x
  3. Step 3: Cross multiply
    256.20x = 353.37 × 156.57
  4. Step 4: Simplify right side
    256.20x = 55,327.14
  5. Step 5: Solve for x
    x = 55,327.14/256.20
  6. Step 6: Final answer
    x = 215.95

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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.