Home / 20,083.20-30,129.60-9,686.40

Finding the Fourth Proportional to 20,083.20, 30,129.60 and 9,686.40

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Solution

The fourth proportional to 20,083.20, 30,129.60 and 9,686.40 is: 14,531.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,083.20 : 30,129.60 = 9,686.40 : x
  2. Step 2: Convert to fraction form
    20,083.20/30,129.60 = 9,686.40/x
  3. Step 3: Cross multiply
    20,083.20x = 30,129.60 × 9,686.40
  4. Step 4: Simplify right side
    20,083.20x = 291,847,357.44
  5. Step 5: Solve for x
    x = 291,847,357.44/20,083.20
  6. Step 6: Final answer
    x = 14,531.92

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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.