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Finding the Fourth Proportional to 995.80, 1,491.90 and 812.20

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Solution

The fourth proportional to 995.80, 1,491.90 and 812.20 is: 1,216.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.80 : 1,491.90 = 812.20 : x
  2. Step 2: Convert to fraction form
    995.80/1,491.90 = 812.20/x
  3. Step 3: Cross multiply
    995.80x = 1,491.90 × 812.20
  4. Step 4: Simplify right side
    995.80x = 1,211,721.18
  5. Step 5: Solve for x
    x = 1,211,721.18/995.80
  6. Step 6: Final answer
    x = 1,216.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.