Home / 13,981.40-20,972.10-4,747.40

Finding the Fourth Proportional to 13,981.40, 20,972.10 and 4,747.40

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Solution

The fourth proportional to 13,981.40, 20,972.10 and 4,747.40 is: 7,121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.40 : 20,972.10 = 4,747.40 : x
  2. Step 2: Convert to fraction form
    13,981.40/20,972.10 = 4,747.40/x
  3. Step 3: Cross multiply
    13,981.40x = 20,972.10 × 4,747.40
  4. Step 4: Simplify right side
    13,981.40x = 99,562,947.54
  5. Step 5: Solve for x
    x = 99,562,947.54/13,981.40
  6. Step 6: Final answer
    x = 7,121.10

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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.