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Finding the Fourth Proportional to 890.91, 1,226.82 and 871.74

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Solution

The fourth proportional to 890.91, 1,226.82 and 871.74 is: 1,200.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.91 : 1,226.82 = 871.74 : x
  2. Step 2: Convert to fraction form
    890.91/1,226.82 = 871.74/x
  3. Step 3: Cross multiply
    890.91x = 1,226.82 × 871.74
  4. Step 4: Simplify right side
    890.91x = 1,069,468.07
  5. Step 5: Solve for x
    x = 1,069,468.07/890.91
  6. Step 6: Final answer
    x = 1,200.42

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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.