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Finding the Fourth Proportional to 923.20, 1,387.83 and 855.56

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Solution

The fourth proportional to 923.20, 1,387.83 and 855.56 is: 1,286.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.20 : 1,387.83 = 855.56 : x
  2. Step 2: Convert to fraction form
    923.20/1,387.83 = 855.56/x
  3. Step 3: Cross multiply
    923.20x = 1,387.83 × 855.56
  4. Step 4: Simplify right side
    923.20x = 1,187,371.83
  5. Step 5: Solve for x
    x = 1,187,371.83/923.20
  6. Step 6: Final answer
    x = 1,286.15

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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.