Home / 20,981.21-28,944.29-12,478.56

Finding the Fourth Proportional to 20,981.21, 28,944.29 and 12,478.56

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Solution

The fourth proportional to 20,981.21, 28,944.29 and 12,478.56 is: 17,214.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.21 : 28,944.29 = 12,478.56 : x
  2. Step 2: Convert to fraction form
    20,981.21/28,944.29 = 12,478.56/x
  3. Step 3: Cross multiply
    20,981.21x = 28,944.29 × 12,478.56
  4. Step 4: Simplify right side
    20,981.21x = 361,182,997.03
  5. Step 5: Solve for x
    x = 361,182,997.03/20,981.21
  6. Step 6: Final answer
    x = 17,214.60

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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.