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Finding the Fourth Proportional to 839.90, 1,158.82 and 662.31

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Solution

The fourth proportional to 839.90, 1,158.82 and 662.31 is: 913.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.90 : 1,158.82 = 662.31 : x
  2. Step 2: Convert to fraction form
    839.90/1,158.82 = 662.31/x
  3. Step 3: Cross multiply
    839.90x = 1,158.82 × 662.31
  4. Step 4: Simplify right side
    839.90x = 767,496.42
  5. Step 5: Solve for x
    x = 767,496.42/839.90
  6. Step 6: Final answer
    x = 913.79

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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.