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Finding the Fourth Proportional to 15,859.20, 21,887.04 and 8,787.84

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Solution

The fourth proportional to 15,859.20, 21,887.04 and 8,787.84 is: 12,127.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.20 : 21,887.04 = 8,787.84 : x
  2. Step 2: Convert to fraction form
    15,859.20/21,887.04 = 8,787.84/x
  3. Step 3: Cross multiply
    15,859.20x = 21,887.04 × 8,787.84
  4. Step 4: Simplify right side
    15,859.20x = 192,339,805.59
  5. Step 5: Solve for x
    x = 192,339,805.59/15,859.20
  6. Step 6: Final answer
    x = 12,127.96

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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.