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Finding the Fourth Proportional to 256.51, 353.97 and 151.57

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Solution

The fourth proportional to 256.51, 353.97 and 151.57 is: 209.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.51 : 353.97 = 151.57 : x
  2. Step 2: Convert to fraction form
    256.51/353.97 = 151.57/x
  3. Step 3: Cross multiply
    256.51x = 353.97 × 151.57
  4. Step 4: Simplify right side
    256.51x = 53,651.68
  5. Step 5: Solve for x
    x = 53,651.68/256.51
  6. Step 6: Final answer
    x = 209.16

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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.