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Finding the Fourth Proportional to 15,758.87, 21,747.69 and 8,685.75

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Solution

The fourth proportional to 15,758.87, 21,747.69 and 8,685.75 is: 11,986.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,758.87 : 21,747.69 = 8,685.75 : x
  2. Step 2: Convert to fraction form
    15,758.87/21,747.69 = 8,685.75/x
  3. Step 3: Cross multiply
    15,758.87x = 21,747.69 × 8,685.75
  4. Step 4: Simplify right side
    15,758.87x = 188,894,998.42
  5. Step 5: Solve for x
    x = 188,894,998.42/15,758.87
  6. Step 6: Final answer
    x = 11,986.58

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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.