Home / 20,421.60-28,186.20-12,462.12

Finding the Fourth Proportional to 20,421.60, 28,186.20 and 12,462.12

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Solution

The fourth proportional to 20,421.60, 28,186.20 and 12,462.12 is: 17,200.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.60 : 28,186.20 = 12,462.12 : x
  2. Step 2: Convert to fraction form
    20,421.60/28,186.20 = 12,462.12/x
  3. Step 3: Cross multiply
    20,421.60x = 28,186.20 × 12,462.12
  4. Step 4: Simplify right side
    20,421.60x = 351,259,806.74
  5. Step 5: Solve for x
    x = 351,259,806.74/20,421.60
  6. Step 6: Final answer
    x = 17,200.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.