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Finding the Fourth Proportional to 177.80, 245.33 and 128.69

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Solution

The fourth proportional to 177.80, 245.33 and 128.69 is: 177.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.80 : 245.33 = 128.69 : x
  2. Step 2: Convert to fraction form
    177.80/245.33 = 128.69/x
  3. Step 3: Cross multiply
    177.80x = 245.33 × 128.69
  4. Step 4: Simplify right side
    177.80x = 31,571.05
  5. Step 5: Solve for x
    x = 31,571.05/177.80
  6. Step 6: Final answer
    x = 177.57

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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.