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Finding the Fourth Proportional to 1,275.84, 1,909.92 and 1,195.84

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Solution

The fourth proportional to 1,275.84, 1,909.92 and 1,195.84 is: 1,790.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.84 : 1,909.92 = 1,195.84 : x
  2. Step 2: Convert to fraction form
    1,275.84/1,909.92 = 1,195.84/x
  3. Step 3: Cross multiply
    1,275.84x = 1,909.92 × 1,195.84
  4. Step 4: Simplify right side
    1,275.84x = 2,283,958.73
  5. Step 5: Solve for x
    x = 2,283,958.73/1,275.84
  6. Step 6: Final answer
    x = 1,790.16

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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.