Home / 11,320.80-16,981.20-7,821.60

Finding the Fourth Proportional to 11,320.80, 16,981.20 and 7,821.60

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Solution

The fourth proportional to 11,320.80, 16,981.20 and 7,821.60 is: 11,732.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,320.80 : 16,981.20 = 7,821.60 : x
  2. Step 2: Convert to fraction form
    11,320.80/16,981.20 = 7,821.60/x
  3. Step 3: Cross multiply
    11,320.80x = 16,981.20 × 7,821.60
  4. Step 4: Simplify right side
    11,320.80x = 132,820,153.92
  5. Step 5: Solve for x
    x = 132,820,153.92/11,320.80
  6. Step 6: Final answer
    x = 11,732.40

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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.