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Finding the Fourth Proportional to 256.98, 386.86 and 234.30

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Solution

The fourth proportional to 256.98, 386.86 and 234.30 is: 352.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 386.86 = 234.30 : x
  2. Step 2: Convert to fraction form
    256.98/386.86 = 234.30/x
  3. Step 3: Cross multiply
    256.98x = 386.86 × 234.30
  4. Step 4: Simplify right side
    256.98x = 90,641.30
  5. Step 5: Solve for x
    x = 90,641.30/256.98
  6. Step 6: Final answer
    x = 352.72

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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.