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Finding the Fourth Proportional to 256.46, 353.81 and 145.91

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Solution

The fourth proportional to 256.46, 353.81 and 145.91 is: 201.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.46 : 353.81 = 145.91 : x
  2. Step 2: Convert to fraction form
    256.46/353.81 = 145.91/x
  3. Step 3: Cross multiply
    256.46x = 353.81 × 145.91
  4. Step 4: Simplify right side
    256.46x = 51,626.06
  5. Step 5: Solve for x
    x = 51,626.06/256.46
  6. Step 6: Final answer
    x = 201.30

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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.