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Finding the Fourth Proportional to 1,439.37, 2,159.06 and 708.80

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Solution

The fourth proportional to 1,439.37, 2,159.06 and 708.80 is: 1,063.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.37 : 2,159.06 = 708.80 : x
  2. Step 2: Convert to fraction form
    1,439.37/2,159.06 = 708.80/x
  3. Step 3: Cross multiply
    1,439.37x = 2,159.06 × 708.80
  4. Step 4: Simplify right side
    1,439.37x = 1,530,339.53
  5. Step 5: Solve for x
    x = 1,530,339.53/1,439.37
  6. Step 6: Final answer
    x = 1,063.20

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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.