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Finding the Fourth Proportional to 1,181.65, 1,631.97 and 807.97

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Solution

The fourth proportional to 1,181.65, 1,631.97 and 807.97 is: 1,115.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.65 : 1,631.97 = 807.97 : x
  2. Step 2: Convert to fraction form
    1,181.65/1,631.97 = 807.97/x
  3. Step 3: Cross multiply
    1,181.65x = 1,631.97 × 807.97
  4. Step 4: Simplify right side
    1,181.65x = 1,318,582.80
  5. Step 5: Solve for x
    x = 1,318,582.80/1,181.65
  6. Step 6: Final answer
    x = 1,115.88

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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.