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Finding the Fourth Proportional to 1,356.70, 1,872.30 and 767.20

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Solution

The fourth proportional to 1,356.70, 1,872.30 and 767.20 is: 1,058.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.70 : 1,872.30 = 767.20 : x
  2. Step 2: Convert to fraction form
    1,356.70/1,872.30 = 767.20/x
  3. Step 3: Cross multiply
    1,356.70x = 1,872.30 × 767.20
  4. Step 4: Simplify right side
    1,356.70x = 1,436,428.56
  5. Step 5: Solve for x
    x = 1,436,428.56/1,356.70
  6. Step 6: Final answer
    x = 1,058.77

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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.