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Finding the Fourth Proportional to 180.40, 248.70 and 128.56

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Solution

The fourth proportional to 180.40, 248.70 and 128.56 is: 177.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.40 : 248.70 = 128.56 : x
  2. Step 2: Convert to fraction form
    180.40/248.70 = 128.56/x
  3. Step 3: Cross multiply
    180.40x = 248.70 × 128.56
  4. Step 4: Simplify right side
    180.40x = 31,973.01
  5. Step 5: Solve for x
    x = 31,973.01/180.40
  6. Step 6: Final answer
    x = 177.23

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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.