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Finding the Fourth Proportional to 1,275.87, 1,911 and 660.18

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Solution

The fourth proportional to 1,275.87, 1,911 and 660.18 is: 988.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.87 : 1,911 = 660.18 : x
  2. Step 2: Convert to fraction form
    1,275.87/1,911 = 660.18/x
  3. Step 3: Cross multiply
    1,275.87x = 1,911 × 660.18
  4. Step 4: Simplify right side
    1,275.87x = 1,261,594.43
  5. Step 5: Solve for x
    x = 1,261,594.43/1,275.87
  6. Step 6: Final answer
    x = 988.81

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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.