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Finding the Fourth Proportional to 178.98, 247.10 and 113.60

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Solution

The fourth proportional to 178.98, 247.10 and 113.60 is: 156.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.98 : 247.10 = 113.60 : x
  2. Step 2: Convert to fraction form
    178.98/247.10 = 113.60/x
  3. Step 3: Cross multiply
    178.98x = 247.10 × 113.60
  4. Step 4: Simplify right side
    178.98x = 28,070.56
  5. Step 5: Solve for x
    x = 28,070.56/178.98
  6. Step 6: Final answer
    x = 156.84

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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.