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Finding the Fourth Proportional to 822.80, 1,138.12 and 671.12

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Solution

The fourth proportional to 822.80, 1,138.12 and 671.12 is: 928.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.80 : 1,138.12 = 671.12 : x
  2. Step 2: Convert to fraction form
    822.80/1,138.12 = 671.12/x
  3. Step 3: Cross multiply
    822.80x = 1,138.12 × 671.12
  4. Step 4: Simplify right side
    822.80x = 763,815.09
  5. Step 5: Solve for x
    x = 763,815.09/822.80
  6. Step 6: Final answer
    x = 928.31

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1.5x scale

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.