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Finding the Fourth Proportional to 819.85, 1,131.85 and 632.94

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Solution

The fourth proportional to 819.85, 1,131.85 and 632.94 is: 873.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.85 : 1,131.85 = 632.94 : x
  2. Step 2: Convert to fraction form
    819.85/1,131.85 = 632.94/x
  3. Step 3: Cross multiply
    819.85x = 1,131.85 × 632.94
  4. Step 4: Simplify right side
    819.85x = 716,393.14
  5. Step 5: Solve for x
    x = 716,393.14/819.85
  6. Step 6: Final answer
    x = 873.81

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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.