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Finding the Fourth Proportional to 104.51, 144.25 and 71.81

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Solution

The fourth proportional to 104.51, 144.25 and 71.81 is: 99.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.51 : 144.25 = 71.81 : x
  2. Step 2: Convert to fraction form
    104.51/144.25 = 71.81/x
  3. Step 3: Cross multiply
    104.51x = 144.25 × 71.81
  4. Step 4: Simplify right side
    104.51x = 10,358.77
  5. Step 5: Solve for x
    x = 10,358.77/104.51
  6. Step 6: Final answer
    x = 99.12

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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.