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Finding the Fourth Proportional to 256.31, 353.72 and 145.78

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Solution

The fourth proportional to 256.31, 353.72 and 145.78 is: 201.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.31 : 353.72 = 145.78 : x
  2. Step 2: Convert to fraction form
    256.31/353.72 = 145.78/x
  3. Step 3: Cross multiply
    256.31x = 353.72 × 145.78
  4. Step 4: Simplify right side
    256.31x = 51,564.57
  5. Step 5: Solve for x
    x = 51,564.57/256.31
  6. Step 6: Final answer
    x = 201.18

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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.