Home / 20,838.50-28,756.89-11,278.17

Finding the Fourth Proportional to 20,838.50, 28,756.89 and 11,278.17

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Solution

The fourth proportional to 20,838.50, 28,756.89 and 11,278.17 is: 15,563.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,838.50 : 28,756.89 = 11,278.17 : x
  2. Step 2: Convert to fraction form
    20,838.50/28,756.89 = 11,278.17/x
  3. Step 3: Cross multiply
    20,838.50x = 28,756.89 × 11,278.17
  4. Step 4: Simplify right side
    20,838.50x = 324,325,094.09
  5. Step 5: Solve for x
    x = 324,325,094.09/20,838.50
  6. Step 6: Final answer
    x = 15,563.75

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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.