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Finding the Fourth Proportional to 256.22, 353.62 and 145.72

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Solution

The fourth proportional to 256.22, 353.62 and 145.72 is: 201.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.22 : 353.62 = 145.72 : x
  2. Step 2: Convert to fraction form
    256.22/353.62 = 145.72/x
  3. Step 3: Cross multiply
    256.22x = 353.62 × 145.72
  4. Step 4: Simplify right side
    256.22x = 51,529.51
  5. Step 5: Solve for x
    x = 51,529.51/256.22
  6. Step 6: Final answer
    x = 201.11

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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.