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Finding the Fourth Proportional to 9,986.87, 13,781.87 and 5,510.62

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Solution

The fourth proportional to 9,986.87, 13,781.87 and 5,510.62 is: 7,604.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,986.87 : 13,781.87 = 5,510.62 : x
  2. Step 2: Convert to fraction form
    9,986.87/13,781.87 = 5,510.62/x
  3. Step 3: Cross multiply
    9,986.87x = 13,781.87 × 5,510.62
  4. Step 4: Simplify right side
    9,986.87x = 75,946,658.80
  5. Step 5: Solve for x
    x = 75,946,658.80/9,986.87
  6. Step 6: Final answer
    x = 7,604.65

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1.5x scale

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.