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Finding the Fourth Proportional to 1,143.92, 1,577.40 and 812

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Solution

The fourth proportional to 1,143.92, 1,577.40 and 812 is: 1,119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.92 : 1,577.40 = 812 : x
  2. Step 2: Convert to fraction form
    1,143.92/1,577.40 = 812/x
  3. Step 3: Cross multiply
    1,143.92x = 1,577.40 × 812
  4. Step 4: Simplify right side
    1,143.92x = 1,280,848.80
  5. Step 5: Solve for x
    x = 1,280,848.80/1,143.92
  6. Step 6: Final answer
    x = 1,119.70

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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.