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Finding the Fourth Proportional to 15,759.20, 21,747.70 and 8,589.12

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Solution

The fourth proportional to 15,759.20, 21,747.70 and 8,589.12 is: 11,852.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,759.20 : 21,747.70 = 8,589.12 : x
  2. Step 2: Convert to fraction form
    15,759.20/21,747.70 = 8,589.12/x
  3. Step 3: Cross multiply
    15,759.20x = 21,747.70 × 8,589.12
  4. Step 4: Simplify right side
    15,759.20x = 186,793,605.02
  5. Step 5: Solve for x
    x = 186,793,605.02/15,759.20
  6. Step 6: Final answer
    x = 11,852.99

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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.