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Finding the Fourth Proportional to 690,676, 1,036,162.20 and 391,300

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Solution

The fourth proportional to 690,676, 1,036,162.20 and 391,300 is: 587,033.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,676 : 1,036,162.20 = 391,300 : x
  2. Step 2: Convert to fraction form
    690,676/1,036,162.20 = 391,300/x
  3. Step 3: Cross multiply
    690,676x = 1,036,162.20 × 391,300
  4. Step 4: Simplify right side
    690,676x = 405,450,268,860
  5. Step 5: Solve for x
    x = 405,450,268,860/690,676
  6. Step 6: Final answer
    x = 587,033.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.