Home / 13,787.40-19,025.16-8,121.78

Finding the Fourth Proportional to 13,787.40, 19,025.16 and 8,121.78

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Solution

The fourth proportional to 13,787.40, 19,025.16 and 8,121.78 is: 11,207.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,787.40 : 19,025.16 = 8,121.78 : x
  2. Step 2: Convert to fraction form
    13,787.40/19,025.16 = 8,121.78/x
  3. Step 3: Cross multiply
    13,787.40x = 19,025.16 × 8,121.78
  4. Step 4: Simplify right side
    13,787.40x = 154,518,163.98
  5. Step 5: Solve for x
    x = 154,518,163.98/13,787.40
  6. Step 6: Final answer
    x = 11,207.20

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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.