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Finding the Fourth Proportional to 1,439.64, 2,159.97 and 659.82

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Solution

The fourth proportional to 1,439.64, 2,159.97 and 659.82 is: 989.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.64 : 2,159.97 = 659.82 : x
  2. Step 2: Convert to fraction form
    1,439.64/2,159.97 = 659.82/x
  3. Step 3: Cross multiply
    1,439.64x = 2,159.97 × 659.82
  4. Step 4: Simplify right side
    1,439.64x = 1,425,191.41
  5. Step 5: Solve for x
    x = 1,425,191.41/1,439.64
  6. Step 6: Final answer
    x = 989.96

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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.