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Finding the Fourth Proportional to 1,275.15, 1,912.32 and 727.59

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Solution

The fourth proportional to 1,275.15, 1,912.32 and 727.59 is: 1,091.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.15 : 1,912.32 = 727.59 : x
  2. Step 2: Convert to fraction form
    1,275.15/1,912.32 = 727.59/x
  3. Step 3: Cross multiply
    1,275.15x = 1,912.32 × 727.59
  4. Step 4: Simplify right side
    1,275.15x = 1,391,384.91
  5. Step 5: Solve for x
    x = 1,391,384.91/1,275.15
  6. Step 6: Final answer
    x = 1,091.15

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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.