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Finding the Fourth Proportional to 15,864.16, 21,892.80 and 8,790.88

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Solution

The fourth proportional to 15,864.16, 21,892.80 and 8,790.88 is: 12,131.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,864.16 : 21,892.80 = 8,790.88 : x
  2. Step 2: Convert to fraction form
    15,864.16/21,892.80 = 8,790.88/x
  3. Step 3: Cross multiply
    15,864.16x = 21,892.80 × 8,790.88
  4. Step 4: Simplify right side
    15,864.16x = 192,456,977.66
  5. Step 5: Solve for x
    x = 192,456,977.66/15,864.16
  6. Step 6: Final answer
    x = 12,131.56

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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.