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Finding the Fourth Proportional to 15,805.13, 21,811.28 and 8,732.21

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Solution

The fourth proportional to 15,805.13, 21,811.28 and 8,732.21 is: 12,050.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.13 : 21,811.28 = 8,732.21 : x
  2. Step 2: Convert to fraction form
    15,805.13/21,811.28 = 8,732.21/x
  3. Step 3: Cross multiply
    15,805.13x = 21,811.28 × 8,732.21
  4. Step 4: Simplify right side
    15,805.13x = 190,460,524.61
  5. Step 5: Solve for x
    x = 190,460,524.61/15,805.13
  6. Step 6: Final answer
    x = 12,050.55

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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.