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Finding the Fourth Proportional to 256.32, 353.57 and 156.69

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Solution

The fourth proportional to 256.32, 353.57 and 156.69 is: 216.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.32 : 353.57 = 156.69 : x
  2. Step 2: Convert to fraction form
    256.32/353.57 = 156.69/x
  3. Step 3: Cross multiply
    256.32x = 353.57 × 156.69
  4. Step 4: Simplify right side
    256.32x = 55,400.10
  5. Step 5: Solve for x
    x = 55,400.10/256.32
  6. Step 6: Final answer
    x = 216.14

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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.