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Finding the Fourth Proportional to 1,275.75, 1,912.08 and 659.11

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Solution

The fourth proportional to 1,275.75, 1,912.08 and 659.11 is: 987.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.75 : 1,912.08 = 659.11 : x
  2. Step 2: Convert to fraction form
    1,275.75/1,912.08 = 659.11/x
  3. Step 3: Cross multiply
    1,275.75x = 1,912.08 × 659.11
  4. Step 4: Simplify right side
    1,275.75x = 1,260,267.75
  5. Step 5: Solve for x
    x = 1,260,267.75/1,275.75
  6. Step 6: Final answer
    x = 987.87

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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.