Home / 15,787.64-21,786.79-8,713.91

Finding the Fourth Proportional to 15,787.64, 21,786.79 and 8,713.91

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Solution

The fourth proportional to 15,787.64, 21,786.79 and 8,713.91 is: 12,025.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.64 : 21,786.79 = 8,713.91 : x
  2. Step 2: Convert to fraction form
    15,787.64/21,786.79 = 8,713.91/x
  3. Step 3: Cross multiply
    15,787.64x = 21,786.79 × 8,713.91
  4. Step 4: Simplify right side
    15,787.64x = 189,848,127.25
  5. Step 5: Solve for x
    x = 189,848,127.25/15,787.64
  6. Step 6: Final answer
    x = 12,025.11

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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.