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Finding the Fourth Proportional to 896.74, 1,239.11 and 860.29

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Solution

The fourth proportional to 896.74, 1,239.11 and 860.29 is: 1,188.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.74 : 1,239.11 = 860.29 : x
  2. Step 2: Convert to fraction form
    896.74/1,239.11 = 860.29/x
  3. Step 3: Cross multiply
    896.74x = 1,239.11 × 860.29
  4. Step 4: Simplify right side
    896.74x = 1,065,993.94
  5. Step 5: Solve for x
    x = 1,065,993.94/896.74
  6. Step 6: Final answer
    x = 1,188.74

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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.