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Finding the Fourth Proportional to 15,825.31, 21,839.07 and 8,752.21

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Solution

The fourth proportional to 15,825.31, 21,839.07 and 8,752.21 is: 12,078.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,825.31 : 21,839.07 = 8,752.21 : x
  2. Step 2: Convert to fraction form
    15,825.31/21,839.07 = 8,752.21/x
  3. Step 3: Cross multiply
    15,825.31x = 21,839.07 × 8,752.21
  4. Step 4: Simplify right side
    15,825.31x = 191,140,126.84
  5. Step 5: Solve for x
    x = 191,140,126.84/15,825.31
  6. Step 6: Final answer
    x = 12,078.13

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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.