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Finding the Fourth Proportional to 1,356.92, 1,872.42 and 767.45

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Solution

The fourth proportional to 1,356.92, 1,872.42 and 767.45 is: 1,059.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.92 : 1,872.42 = 767.45 : x
  2. Step 2: Convert to fraction form
    1,356.92/1,872.42 = 767.45/x
  3. Step 3: Cross multiply
    1,356.92x = 1,872.42 × 767.45
  4. Step 4: Simplify right side
    1,356.92x = 1,436,979.37
  5. Step 5: Solve for x
    x = 1,436,979.37/1,356.92
  6. Step 6: Final answer
    x = 1,059.00

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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.