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Finding the Fourth Proportional to 104.10, 143.71 and 76.53

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Solution

The fourth proportional to 104.10, 143.71 and 76.53 is: 105.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.10 : 143.71 = 76.53 : x
  2. Step 2: Convert to fraction form
    104.10/143.71 = 76.53/x
  3. Step 3: Cross multiply
    104.10x = 143.71 × 76.53
  4. Step 4: Simplify right side
    104.10x = 10,998.13
  5. Step 5: Solve for x
    x = 10,998.13/104.10
  6. Step 6: Final answer
    x = 105.65

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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.