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Finding the Fourth Proportional to 178.03, 245.60 and 128.80

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Solution

The fourth proportional to 178.03, 245.60 and 128.80 is: 177.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.03 : 245.60 = 128.80 : x
  2. Step 2: Convert to fraction form
    178.03/245.60 = 128.80/x
  3. Step 3: Cross multiply
    178.03x = 245.60 × 128.80
  4. Step 4: Simplify right side
    178.03x = 31,632.05
  5. Step 5: Solve for x
    x = 31,632.05/178.03
  6. Step 6: Final answer
    x = 177.68

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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.