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Finding the Fourth Proportional to 9,890.87, 14,851.39 and 8,640.80

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Solution

The fourth proportional to 9,890.87, 14,851.39 and 8,640.80 is: 12,974.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,890.87 : 14,851.39 = 8,640.80 : x
  2. Step 2: Convert to fraction form
    9,890.87/14,851.39 = 8,640.80/x
  3. Step 3: Cross multiply
    9,890.87x = 14,851.39 × 8,640.80
  4. Step 4: Simplify right side
    9,890.87x = 128,327,794.85
  5. Step 5: Solve for x
    x = 128,327,794.85/9,890.87
  6. Step 6: Final answer
    x = 12,974.37

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1.5x scale

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.