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Finding the Fourth Proportional to 256.66, 354.18 and 151.75

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Solution

The fourth proportional to 256.66, 354.18 and 151.75 is: 209.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.66 : 354.18 = 151.75 : x
  2. Step 2: Convert to fraction form
    256.66/354.18 = 151.75/x
  3. Step 3: Cross multiply
    256.66x = 354.18 × 151.75
  4. Step 4: Simplify right side
    256.66x = 53,746.82
  5. Step 5: Solve for x
    x = 53,746.82/256.66
  6. Step 6: Final answer
    x = 209.41

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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.