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Finding the Fourth Proportional to 5,430.80, 8,149.80 and 3,090.80

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Solution

The fourth proportional to 5,430.80, 8,149.80 and 3,090.80 is: 4,638.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,430.80 : 8,149.80 = 3,090.80 : x
  2. Step 2: Convert to fraction form
    5,430.80/8,149.80 = 3,090.80/x
  3. Step 3: Cross multiply
    5,430.80x = 8,149.80 × 3,090.80
  4. Step 4: Simplify right side
    5,430.80x = 25,189,401.84
  5. Step 5: Solve for x
    x = 25,189,401.84/5,430.80
  6. Step 6: Final answer
    x = 4,638.25

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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.