Home / 5,426.40-8,139.60-2,138.40

Finding the Fourth Proportional to 5,426.40, 8,139.60 and 2,138.40

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Solution

The fourth proportional to 5,426.40, 8,139.60 and 2,138.40 is: 3,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,426.40 : 8,139.60 = 2,138.40 : x
  2. Step 2: Convert to fraction form
    5,426.40/8,139.60 = 2,138.40/x
  3. Step 3: Cross multiply
    5,426.40x = 8,139.60 × 2,138.40
  4. Step 4: Simplify right side
    5,426.40x = 17,405,720.64
  5. Step 5: Solve for x
    x = 17,405,720.64/5,426.40
  6. Step 6: Final answer
    x = 3,207.60

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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.