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Finding the Fourth Proportional to 949.31, 1,311.57 and 810.89

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Solution

The fourth proportional to 949.31, 1,311.57 and 810.89 is: 1,120.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.31 : 1,311.57 = 810.89 : x
  2. Step 2: Convert to fraction form
    949.31/1,311.57 = 810.89/x
  3. Step 3: Cross multiply
    949.31x = 1,311.57 × 810.89
  4. Step 4: Simplify right side
    949.31x = 1,063,539.00
  5. Step 5: Solve for x
    x = 1,063,539.00/949.31
  6. Step 6: Final answer
    x = 1,120.33

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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.