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Finding the Fourth Proportional to 5,420.80, 8,131.20 and 3,671.20

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Solution

The fourth proportional to 5,420.80, 8,131.20 and 3,671.20 is: 5,506.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.80 : 8,131.20 = 3,671.20 : x
  2. Step 2: Convert to fraction form
    5,420.80/8,131.20 = 3,671.20/x
  3. Step 3: Cross multiply
    5,420.80x = 8,131.20 × 3,671.20
  4. Step 4: Simplify right side
    5,420.80x = 29,851,261.44
  5. Step 5: Solve for x
    x = 29,851,261.44/5,420.80
  6. Step 6: Final answer
    x = 5,506.80

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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.