Home / 5,420.15-8,128.20-1,908.80

Finding the Fourth Proportional to 5,420.15, 8,128.20 and 1,908.80

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Solution

The fourth proportional to 5,420.15, 8,128.20 and 1,908.80 is: 2,862.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.15 : 8,128.20 = 1,908.80 : x
  2. Step 2: Convert to fraction form
    5,420.15/8,128.20 = 1,908.80/x
  3. Step 3: Cross multiply
    5,420.15x = 8,128.20 × 1,908.80
  4. Step 4: Simplify right side
    5,420.15x = 15,515,108.16
  5. Step 5: Solve for x
    x = 15,515,108.16/5,420.15
  6. Step 6: Final answer
    x = 2,862.49

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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.