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Finding the Fourth Proportional to 1,356.92, 1,872.66 and 767.48

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Solution

The fourth proportional to 1,356.92, 1,872.66 and 767.48 is: 1,059.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.92 : 1,872.66 = 767.48 : x
  2. Step 2: Convert to fraction form
    1,356.92/1,872.66 = 767.48/x
  3. Step 3: Cross multiply
    1,356.92x = 1,872.66 × 767.48
  4. Step 4: Simplify right side
    1,356.92x = 1,437,229.10
  5. Step 5: Solve for x
    x = 1,437,229.10/1,356.92
  6. Step 6: Final answer
    x = 1,059.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.