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Finding the Fourth Proportional to 8,709.80, 12,022.59 and 5,172.99

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Solution

The fourth proportional to 8,709.80, 12,022.59 and 5,172.99 is: 7,140.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,709.80 : 12,022.59 = 5,172.99 : x
  2. Step 2: Convert to fraction form
    8,709.80/12,022.59 = 5,172.99/x
  3. Step 3: Cross multiply
    8,709.80x = 12,022.59 × 5,172.99
  4. Step 4: Simplify right side
    8,709.80x = 62,192,737.84
  5. Step 5: Solve for x
    x = 62,192,737.84/8,709.80
  6. Step 6: Final answer
    x = 7,140.55

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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.