Home / 8,138.40-12,207.60-5,319.60

Finding the Fourth Proportional to 8,138.40, 12,207.60 and 5,319.60

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Solution

The fourth proportional to 8,138.40, 12,207.60 and 5,319.60 is: 7,979.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.40 : 12,207.60 = 5,319.60 : x
  2. Step 2: Convert to fraction form
    8,138.40/12,207.60 = 5,319.60/x
  3. Step 3: Cross multiply
    8,138.40x = 12,207.60 × 5,319.60
  4. Step 4: Simplify right side
    8,138.40x = 64,939,548.96
  5. Step 5: Solve for x
    x = 64,939,548.96/8,138.40
  6. Step 6: Final answer
    x = 7,979.40

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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.