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Finding the Fourth Proportional to 15,839.31, 21,857.94 and 8,765.79

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Solution

The fourth proportional to 15,839.31, 21,857.94 and 8,765.79 is: 12,096.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,839.31 : 21,857.94 = 8,765.79 : x
  2. Step 2: Convert to fraction form
    15,839.31/21,857.94 = 8,765.79/x
  3. Step 3: Cross multiply
    15,839.31x = 21,857.94 × 8,765.79
  4. Step 4: Simplify right side
    15,839.31x = 191,602,111.87
  5. Step 5: Solve for x
    x = 191,602,111.87/15,839.31
  6. Step 6: Final answer
    x = 12,096.62

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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.