Home / 10,121.20-15,181.80-5,200.45

Finding the Fourth Proportional to 10,121.20, 15,181.80 and 5,200.45

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Solution

The fourth proportional to 10,121.20, 15,181.80 and 5,200.45 is: 7,800.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,121.20 : 15,181.80 = 5,200.45 : x
  2. Step 2: Convert to fraction form
    10,121.20/15,181.80 = 5,200.45/x
  3. Step 3: Cross multiply
    10,121.20x = 15,181.80 × 5,200.45
  4. Step 4: Simplify right side
    10,121.20x = 78,952,191.81
  5. Step 5: Solve for x
    x = 78,952,191.81/10,121.20
  6. Step 6: Final answer
    x = 7,800.68

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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.