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Finding the Fourth Proportional to 3,781.96, 5,672.58 and 1,316.68

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Solution

The fourth proportional to 3,781.96, 5,672.58 and 1,316.68 is: 1,974.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,781.96 : 5,672.58 = 1,316.68 : x
  2. Step 2: Convert to fraction form
    3,781.96/5,672.58 = 1,316.68/x
  3. Step 3: Cross multiply
    3,781.96x = 5,672.58 × 1,316.68
  4. Step 4: Simplify right side
    3,781.96x = 7,468,972.63
  5. Step 5: Solve for x
    x = 7,468,972.63/3,781.96
  6. Step 6: Final answer
    x = 1,974.89

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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.