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Finding the Fourth Proportional to 180.90, 271.42 and 72.70

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Solution

The fourth proportional to 180.90, 271.42 and 72.70 is: 109.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.90 : 271.42 = 72.70 : x
  2. Step 2: Convert to fraction form
    180.90/271.42 = 72.70/x
  3. Step 3: Cross multiply
    180.90x = 271.42 × 72.70
  4. Step 4: Simplify right side
    180.90x = 19,732.23
  5. Step 5: Solve for x
    x = 19,732.23/180.90
  6. Step 6: Final answer
    x = 109.08

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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.