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Finding the Fourth Proportional to 178.98, 247.15 and 113.50

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Solution

The fourth proportional to 178.98, 247.15 and 113.50 is: 156.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.98 : 247.15 = 113.50 : x
  2. Step 2: Convert to fraction form
    178.98/247.15 = 113.50/x
  3. Step 3: Cross multiply
    178.98x = 247.15 × 113.50
  4. Step 4: Simplify right side
    178.98x = 28,051.53
  5. Step 5: Solve for x
    x = 28,051.53/178.98
  6. Step 6: Final answer
    x = 156.73

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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.