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Finding the Fourth Proportional to 1,275.66, 1,912.55 and 728.19

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Solution

The fourth proportional to 1,275.66, 1,912.55 and 728.19 is: 1,091.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.66 : 1,912.55 = 728.19 : x
  2. Step 2: Convert to fraction form
    1,275.66/1,912.55 = 728.19/x
  3. Step 3: Cross multiply
    1,275.66x = 1,912.55 × 728.19
  4. Step 4: Simplify right side
    1,275.66x = 1,392,696.14
  5. Step 5: Solve for x
    x = 1,392,696.14/1,275.66
  6. Step 6: Final answer
    x = 1,091.75

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1.5x scale

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.