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Finding the Fourth Proportional to 15,755.20, 21,742.05 and 8,681.20

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Solution

The fourth proportional to 15,755.20, 21,742.05 and 8,681.20 is: 11,979.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,755.20 : 21,742.05 = 8,681.20 : x
  2. Step 2: Convert to fraction form
    15,755.20/21,742.05 = 8,681.20/x
  3. Step 3: Cross multiply
    15,755.20x = 21,742.05 × 8,681.20
  4. Step 4: Simplify right side
    15,755.20x = 188,747,084.46
  5. Step 5: Solve for x
    x = 188,747,084.46/15,755.20
  6. Step 6: Final answer
    x = 11,979.99

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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.