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Finding the Fourth Proportional to 20,224, 27,912 and 19,338.40

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Solution

The fourth proportional to 20,224, 27,912 and 19,338.40 is: 26,689.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,224 : 27,912 = 19,338.40 : x
  2. Step 2: Convert to fraction form
    20,224/27,912 = 19,338.40/x
  3. Step 3: Cross multiply
    20,224x = 27,912 × 19,338.40
  4. Step 4: Simplify right side
    20,224x = 539,773,420.80
  5. Step 5: Solve for x
    x = 539,773,420.80/20,224
  6. Step 6: Final answer
    x = 26,689.75

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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.