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Finding the Fourth Proportional to 1,439.64, 2,158.92 and 708.75

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Solution

The fourth proportional to 1,439.64, 2,158.92 and 708.75 is: 1,062.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.64 : 2,158.92 = 708.75 : x
  2. Step 2: Convert to fraction form
    1,439.64/2,158.92 = 708.75/x
  3. Step 3: Cross multiply
    1,439.64x = 2,158.92 × 708.75
  4. Step 4: Simplify right side
    1,439.64x = 1,530,134.55
  5. Step 5: Solve for x
    x = 1,530,134.55/1,439.64
  6. Step 6: Final answer
    x = 1,062.86

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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.