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Finding the Fourth Proportional to 927.10, 1,387.09 and 823.20

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Solution

The fourth proportional to 927.10, 1,387.09 and 823.20 is: 1,231.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.10 : 1,387.09 = 823.20 : x
  2. Step 2: Convert to fraction form
    927.10/1,387.09 = 823.20/x
  3. Step 3: Cross multiply
    927.10x = 1,387.09 × 823.20
  4. Step 4: Simplify right side
    927.10x = 1,141,852.49
  5. Step 5: Solve for x
    x = 1,141,852.49/927.10
  6. Step 6: Final answer
    x = 1,231.64

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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.