Home / 20,128.60-30,135.30-12,352.60

Finding the Fourth Proportional to 20,128.60, 30,135.30 and 12,352.60

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Solution

The fourth proportional to 20,128.60, 30,135.30 and 12,352.60 is: 18,493.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.60 : 30,135.30 = 12,352.60 : x
  2. Step 2: Convert to fraction form
    20,128.60/30,135.30 = 12,352.60/x
  3. Step 3: Cross multiply
    20,128.60x = 30,135.30 × 12,352.60
  4. Step 4: Simplify right side
    20,128.60x = 372,249,306.78
  5. Step 5: Solve for x
    x = 372,249,306.78/20,128.60
  6. Step 6: Final answer
    x = 18,493.55

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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.