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Finding the Fourth Proportional to 2,160.92, 3,241.80 and 862.40

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Solution

The fourth proportional to 2,160.92, 3,241.80 and 862.40 is: 1,293.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.92 : 3,241.80 = 862.40 : x
  2. Step 2: Convert to fraction form
    2,160.92/3,241.80 = 862.40/x
  3. Step 3: Cross multiply
    2,160.92x = 3,241.80 × 862.40
  4. Step 4: Simplify right side
    2,160.92x = 2,795,728.32
  5. Step 5: Solve for x
    x = 2,795,728.32/2,160.92
  6. Step 6: Final answer
    x = 1,293.77

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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.