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Finding the Fourth Proportional to 820.01, 1,131.14 and 679.31

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Solution

The fourth proportional to 820.01, 1,131.14 and 679.31 is: 937.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.01 : 1,131.14 = 679.31 : x
  2. Step 2: Convert to fraction form
    820.01/1,131.14 = 679.31/x
  3. Step 3: Cross multiply
    820.01x = 1,131.14 × 679.31
  4. Step 4: Simplify right side
    820.01x = 768,385.66
  5. Step 5: Solve for x
    x = 768,385.66/820.01
  6. Step 6: Final answer
    x = 937.05

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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.