Home / 5,419.40-8,129.10-2,131.40

Finding the Fourth Proportional to 5,419.40, 8,129.10 and 2,131.40

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Solution

The fourth proportional to 5,419.40, 8,129.10 and 2,131.40 is: 3,197.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.40 : 8,129.10 = 2,131.40 : x
  2. Step 2: Convert to fraction form
    5,419.40/8,129.10 = 2,131.40/x
  3. Step 3: Cross multiply
    5,419.40x = 8,129.10 × 2,131.40
  4. Step 4: Simplify right side
    5,419.40x = 17,326,363.74
  5. Step 5: Solve for x
    x = 17,326,363.74/5,419.40
  6. Step 6: Final answer
    x = 3,197.10

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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.