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Finding the Fourth Proportional to 256.45, 353.90 and 156.87

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Solution

The fourth proportional to 256.45, 353.90 and 156.87 is: 216.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.45 : 353.90 = 156.87 : x
  2. Step 2: Convert to fraction form
    256.45/353.90 = 156.87/x
  3. Step 3: Cross multiply
    256.45x = 353.90 × 156.87
  4. Step 4: Simplify right side
    256.45x = 55,516.29
  5. Step 5: Solve for x
    x = 55,516.29/256.45
  6. Step 6: Final answer
    x = 216.48

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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.