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Finding the Fourth Proportional to 1,275.28, 1,911.36 and 727.72

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Solution

The fourth proportional to 1,275.28, 1,911.36 and 727.72 is: 1,090.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.28 : 1,911.36 = 727.72 : x
  2. Step 2: Convert to fraction form
    1,275.28/1,911.36 = 727.72/x
  3. Step 3: Cross multiply
    1,275.28x = 1,911.36 × 727.72
  4. Step 4: Simplify right side
    1,275.28x = 1,390,934.90
  5. Step 5: Solve for x
    x = 1,390,934.90/1,275.28
  6. Step 6: Final answer
    x = 1,090.69

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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.