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Finding the Fourth Proportional to 1,436.74, 1,982.70 and 839.65

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Solution

The fourth proportional to 1,436.74, 1,982.70 and 839.65 is: 1,158.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.74 : 1,982.70 = 839.65 : x
  2. Step 2: Convert to fraction form
    1,436.74/1,982.70 = 839.65/x
  3. Step 3: Cross multiply
    1,436.74x = 1,982.70 × 839.65
  4. Step 4: Simplify right side
    1,436.74x = 1,664,769.10
  5. Step 5: Solve for x
    x = 1,664,769.10/1,436.74
  6. Step 6: Final answer
    x = 1,158.71

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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.