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Finding the Fourth Proportional to 180.96, 271.40 and 99.80

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Solution

The fourth proportional to 180.96, 271.40 and 99.80 is: 149.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.96 : 271.40 = 99.80 : x
  2. Step 2: Convert to fraction form
    180.96/271.40 = 99.80/x
  3. Step 3: Cross multiply
    180.96x = 271.40 × 99.80
  4. Step 4: Simplify right side
    180.96x = 27,085.72
  5. Step 5: Solve for x
    x = 27,085.72/180.96
  6. Step 6: Final answer
    x = 149.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.