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Finding the Fourth Proportional to 839.21, 1,158.25 and 699.11

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Solution

The fourth proportional to 839.21, 1,158.25 and 699.11 is: 964.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.21 : 1,158.25 = 699.11 : x
  2. Step 2: Convert to fraction form
    839.21/1,158.25 = 699.11/x
  3. Step 3: Cross multiply
    839.21x = 1,158.25 × 699.11
  4. Step 4: Simplify right side
    839.21x = 809,739.02
  5. Step 5: Solve for x
    x = 809,739.02/839.21
  6. Step 6: Final answer
    x = 964.88

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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.