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Finding the Fourth Proportional to 6,986,573.61, 9,641,372.81 and 3,930,780.57

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Solution

The fourth proportional to 6,986,573.61, 9,641,372.81 and 3,930,780.57 is: 5,424,421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,986,573.61 : 9,641,372.81 = 3,930,780.57 : x
  2. Step 2: Convert to fraction form
    6,986,573.61/9,641,372.81 = 3,930,780.57/x
  3. Step 3: Cross multiply
    6,986,573.61x = 9,641,372.81 × 3,930,780.57
  4. Step 4: Simplify right side
    6,986,573.61x = 37,898,120,890,020.40
  5. Step 5: Solve for x
    x = 37,898,120,890,020.40/6,986,573.61
  6. Step 6: Final answer
    x = 5,424,421.61

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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.