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Finding the Fourth Proportional to 178.96, 247.12 and 170.80

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Solution

The fourth proportional to 178.96, 247.12 and 170.80 is: 235.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.96 : 247.12 = 170.80 : x
  2. Step 2: Convert to fraction form
    178.96/247.12 = 170.80/x
  3. Step 3: Cross multiply
    178.96x = 247.12 × 170.80
  4. Step 4: Simplify right side
    178.96x = 42,208.10
  5. Step 5: Solve for x
    x = 42,208.10/178.96
  6. Step 6: Final answer
    x = 235.85

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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.