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Finding the Fourth Proportional to 15,765.88, 21,757.06 and 8,692.55

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Solution

The fourth proportional to 15,765.88, 21,757.06 and 8,692.55 is: 11,995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,765.88 : 21,757.06 = 8,692.55 : x
  2. Step 2: Convert to fraction form
    15,765.88/21,757.06 = 8,692.55/x
  3. Step 3: Cross multiply
    15,765.88x = 21,757.06 × 8,692.55
  4. Step 4: Simplify right side
    15,765.88x = 189,124,331.90
  5. Step 5: Solve for x
    x = 189,124,331.90/15,765.88
  6. Step 6: Final answer
    x = 11,995.80

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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.