Home / 13,639.32-20,422.50-7,787.88

Finding the Fourth Proportional to 13,639.32, 20,422.50 and 7,787.88

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Solution

The fourth proportional to 13,639.32, 20,422.50 and 7,787.88 is: 11,660.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.32 : 20,422.50 = 7,787.88 : x
  2. Step 2: Convert to fraction form
    13,639.32/20,422.50 = 7,787.88/x
  3. Step 3: Cross multiply
    13,639.32x = 20,422.50 × 7,787.88
  4. Step 4: Simplify right side
    13,639.32x = 159,047,979.30
  5. Step 5: Solve for x
    x = 159,047,979.30/13,639.32
  6. Step 6: Final answer
    x = 11,660.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.