Home / 7,981.80-11,972.70-7,528.20

Finding the Fourth Proportional to 7,981.80, 11,972.70 and 7,528.20

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Solution

The fourth proportional to 7,981.80, 11,972.70 and 7,528.20 is: 11,292.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.80 : 11,972.70 = 7,528.20 : x
  2. Step 2: Convert to fraction form
    7,981.80/11,972.70 = 7,528.20/x
  3. Step 3: Cross multiply
    7,981.80x = 11,972.70 × 7,528.20
  4. Step 4: Simplify right side
    7,981.80x = 90,132,880.14
  5. Step 5: Solve for x
    x = 90,132,880.14/7,981.80
  6. Step 6: Final answer
    x = 11,292.30

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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.