Home / 13,991.86-20,981.85-5,220.64

Finding the Fourth Proportional to 13,991.86, 20,981.85 and 5,220.64

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Solution

The fourth proportional to 13,991.86, 20,981.85 and 5,220.64 is: 7,828.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.86 : 20,981.85 = 5,220.64 : x
  2. Step 2: Convert to fraction form
    13,991.86/20,981.85 = 5,220.64/x
  3. Step 3: Cross multiply
    13,991.86x = 20,981.85 × 5,220.64
  4. Step 4: Simplify right side
    13,991.86x = 109,538,685.38
  5. Step 5: Solve for x
    x = 109,538,685.38/13,991.86
  6. Step 6: Final answer
    x = 7,828.74

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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.