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Finding the Fourth Proportional to 104.68, 144.47 and 65.87

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Solution

The fourth proportional to 104.68, 144.47 and 65.87 is: 90.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.68 : 144.47 = 65.87 : x
  2. Step 2: Convert to fraction form
    104.68/144.47 = 65.87/x
  3. Step 3: Cross multiply
    104.68x = 144.47 × 65.87
  4. Step 4: Simplify right side
    104.68x = 9,516.24
  5. Step 5: Solve for x
    x = 9,516.24/104.68
  6. Step 6: Final answer
    x = 90.91

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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.