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Finding the Fourth Proportional to 256.98, 386.84 and 234.66

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Solution

The fourth proportional to 256.98, 386.84 and 234.66 is: 353.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 386.84 = 234.66 : x
  2. Step 2: Convert to fraction form
    256.98/386.84 = 234.66/x
  3. Step 3: Cross multiply
    256.98x = 386.84 × 234.66
  4. Step 4: Simplify right side
    256.98x = 90,775.87
  5. Step 5: Solve for x
    x = 90,775.87/256.98
  6. Step 6: Final answer
    x = 353.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.