Home / 20,615.40-28,447.56-12,118.68

Finding the Fourth Proportional to 20,615.40, 28,447.56 and 12,118.68

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Solution

The fourth proportional to 20,615.40, 28,447.56 and 12,118.68 is: 16,722.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.40 : 28,447.56 = 12,118.68 : x
  2. Step 2: Convert to fraction form
    20,615.40/28,447.56 = 12,118.68/x
  3. Step 3: Cross multiply
    20,615.40x = 28,447.56 × 12,118.68
  4. Step 4: Simplify right side
    20,615.40x = 344,746,876.42
  5. Step 5: Solve for x
    x = 344,746,876.42/20,615.40
  6. Step 6: Final answer
    x = 16,722.78

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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.