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Finding the Fourth Proportional to 1,010.31, 1,391.16 and 896.64

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Solution

The fourth proportional to 1,010.31, 1,391.16 and 896.64 is: 1,234.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.31 : 1,391.16 = 896.64 : x
  2. Step 2: Convert to fraction form
    1,010.31/1,391.16 = 896.64/x
  3. Step 3: Cross multiply
    1,010.31x = 1,391.16 × 896.64
  4. Step 4: Simplify right side
    1,010.31x = 1,247,369.70
  5. Step 5: Solve for x
    x = 1,247,369.70/1,010.31
  6. Step 6: Final answer
    x = 1,234.64

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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.