Home / 5,420.80-8,121.48-5,129.20

Finding the Fourth Proportional to 5,420.80, 8,121.48 and 5,129.20

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Solution

The fourth proportional to 5,420.80, 8,121.48 and 5,129.20 is: 7,684.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.80 : 8,121.48 = 5,129.20 : x
  2. Step 2: Convert to fraction form
    5,420.80/8,121.48 = 5,129.20/x
  3. Step 3: Cross multiply
    5,420.80x = 8,121.48 × 5,129.20
  4. Step 4: Simplify right side
    5,420.80x = 41,656,695.22
  5. Step 5: Solve for x
    x = 41,656,695.22/5,420.80
  6. Step 6: Final answer
    x = 7,684.60

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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.