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Finding the Fourth Proportional to 119.49, 164.80 and 72.80

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Solution

The fourth proportional to 119.49, 164.80 and 72.80 is: 100.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.49 : 164.80 = 72.80 : x
  2. Step 2: Convert to fraction form
    119.49/164.80 = 72.80/x
  3. Step 3: Cross multiply
    119.49x = 164.80 × 72.80
  4. Step 4: Simplify right side
    119.49x = 11,996.25
  5. Step 5: Solve for x
    x = 11,996.25/119.49
  6. Step 6: Final answer
    x = 100.40

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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.