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Finding the Fourth Proportional to 15,692.80, 21,655.20 and 8,617.90

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Solution

The fourth proportional to 15,692.80, 21,655.20 and 8,617.90 is: 11,892.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,692.80 : 21,655.20 = 8,617.90 : x
  2. Step 2: Convert to fraction form
    15,692.80/21,655.20 = 8,617.90/x
  3. Step 3: Cross multiply
    15,692.80x = 21,655.20 × 8,617.90
  4. Step 4: Simplify right side
    15,692.80x = 186,622,348.08
  5. Step 5: Solve for x
    x = 186,622,348.08/15,692.80
  6. Step 6: Final answer
    x = 11,892.23

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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.