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Finding the Fourth Proportional to 15,759.72, 21,747.56 and 8,685.59

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Solution

The fourth proportional to 15,759.72, 21,747.56 and 8,685.59 is: 11,985.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,759.72 : 21,747.56 = 8,685.59 : x
  2. Step 2: Convert to fraction form
    15,759.72/21,747.56 = 8,685.59/x
  3. Step 3: Cross multiply
    15,759.72x = 21,747.56 × 8,685.59
  4. Step 4: Simplify right side
    15,759.72x = 188,890,237.49
  5. Step 5: Solve for x
    x = 188,890,237.49/15,759.72
  6. Step 6: Final answer
    x = 11,985.63

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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.