Home / 5,220.90-7,819.20-3,981.60

Finding the Fourth Proportional to 5,220.90, 7,819.20 and 3,981.60

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Solution

The fourth proportional to 5,220.90, 7,819.20 and 3,981.60 is: 5,963.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,220.90 : 7,819.20 = 3,981.60 : x
  2. Step 2: Convert to fraction form
    5,220.90/7,819.20 = 3,981.60/x
  3. Step 3: Cross multiply
    5,220.90x = 7,819.20 × 3,981.60
  4. Step 4: Simplify right side
    5,220.90x = 31,132,926.72
  5. Step 5: Solve for x
    x = 31,132,926.72/5,220.90
  6. Step 6: Final answer
    x = 5,963.13

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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.