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Finding the Fourth Proportional to 1,161.82, 1,742.95 and 381.87

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Solution

The fourth proportional to 1,161.82, 1,742.95 and 381.87 is: 572.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.82 : 1,742.95 = 381.87 : x
  2. Step 2: Convert to fraction form
    1,161.82/1,742.95 = 381.87/x
  3. Step 3: Cross multiply
    1,161.82x = 1,742.95 × 381.87
  4. Step 4: Simplify right side
    1,161.82x = 665,572.11
  5. Step 5: Solve for x
    x = 665,572.11/1,161.82
  6. Step 6: Final answer
    x = 572.87

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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.