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Finding the Fourth Proportional to 1,079.46, 1,489.20 and 659.64

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Solution

The fourth proportional to 1,079.46, 1,489.20 and 659.64 is: 910.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.46 : 1,489.20 = 659.64 : x
  2. Step 2: Convert to fraction form
    1,079.46/1,489.20 = 659.64/x
  3. Step 3: Cross multiply
    1,079.46x = 1,489.20 × 659.64
  4. Step 4: Simplify right side
    1,079.46x = 982,335.89
  5. Step 5: Solve for x
    x = 982,335.89/1,079.46
  6. Step 6: Final answer
    x = 910.03

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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.