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Finding the Fourth Proportional to 256.12, 353.43 and 145.59

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Solution

The fourth proportional to 256.12, 353.43 and 145.59 is: 200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.12 : 353.43 = 145.59 : x
  2. Step 2: Convert to fraction form
    256.12/353.43 = 145.59/x
  3. Step 3: Cross multiply
    256.12x = 353.43 × 145.59
  4. Step 4: Simplify right side
    256.12x = 51,455.87
  5. Step 5: Solve for x
    x = 51,455.87/256.12
  6. Step 6: Final answer
    x = 200.91

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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.