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Finding the Fourth Proportional to 15,870, 21,900.60 and 8,797.49

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Solution

The fourth proportional to 15,870, 21,900.60 and 8,797.49 is: 12,140.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870 : 21,900.60 = 8,797.49 : x
  2. Step 2: Convert to fraction form
    15,870/21,900.60 = 8,797.49/x
  3. Step 3: Cross multiply
    15,870x = 21,900.60 × 8,797.49
  4. Step 4: Simplify right side
    15,870x = 192,670,309.49
  5. Step 5: Solve for x
    x = 192,670,309.49/15,870
  6. Step 6: Final answer
    x = 12,140.54

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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.