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Finding the Fourth Proportional to 15,828.88, 21,842.38 and 8,755.15

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Solution

The fourth proportional to 15,828.88, 21,842.38 and 8,755.15 is: 12,081.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,828.88 : 21,842.38 = 8,755.15 : x
  2. Step 2: Convert to fraction form
    15,828.88/21,842.38 = 8,755.15/x
  3. Step 3: Cross multiply
    15,828.88x = 21,842.38 × 8,755.15
  4. Step 4: Simplify right side
    15,828.88x = 191,233,313.26
  5. Step 5: Solve for x
    x = 191,233,313.26/15,828.88
  6. Step 6: Final answer
    x = 12,081.29

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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.