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Finding the Fourth Proportional to 256.19, 353.51 and 151.31

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Solution

The fourth proportional to 256.19, 353.51 and 151.31 is: 208.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.19 : 353.51 = 151.31 : x
  2. Step 2: Convert to fraction form
    256.19/353.51 = 151.31/x
  3. Step 3: Cross multiply
    256.19x = 353.51 × 151.31
  4. Step 4: Simplify right side
    256.19x = 53,487.07
  5. Step 5: Solve for x
    x = 53,487.07/256.19
  6. Step 6: Final answer
    x = 208.78

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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.