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Finding the Fourth Proportional to 834.80, 1,145.30 and 813.24

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Solution

The fourth proportional to 834.80, 1,145.30 and 813.24 is: 1,115.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.80 : 1,145.30 = 813.24 : x
  2. Step 2: Convert to fraction form
    834.80/1,145.30 = 813.24/x
  3. Step 3: Cross multiply
    834.80x = 1,145.30 × 813.24
  4. Step 4: Simplify right side
    834.80x = 931,399.71
  5. Step 5: Solve for x
    x = 931,399.71/834.80
  6. Step 6: Final answer
    x = 1,115.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.