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Finding the Fourth Proportional to 178.20, 245.88 and 128.98

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Solution

The fourth proportional to 178.20, 245.88 and 128.98 is: 177.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.20 : 245.88 = 128.98 : x
  2. Step 2: Convert to fraction form
    178.20/245.88 = 128.98/x
  3. Step 3: Cross multiply
    178.20x = 245.88 × 128.98
  4. Step 4: Simplify right side
    178.20x = 31,713.60
  5. Step 5: Solve for x
    x = 31,713.60/178.20
  6. Step 6: Final answer
    x = 177.97

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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.