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Finding the Fourth Proportional to 1,275.89, 1,916.05 and 759.15

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Solution

The fourth proportional to 1,275.89, 1,916.05 and 759.15 is: 1,140.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.89 : 1,916.05 = 759.15 : x
  2. Step 2: Convert to fraction form
    1,275.89/1,916.05 = 759.15/x
  3. Step 3: Cross multiply
    1,275.89x = 1,916.05 × 759.15
  4. Step 4: Simplify right side
    1,275.89x = 1,454,569.36
  5. Step 5: Solve for x
    x = 1,454,569.36/1,275.89
  6. Step 6: Final answer
    x = 1,140.04

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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.