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Finding the Fourth Proportional to 20,419.28, 30,622.44 and 7,938.44

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Solution

The fourth proportional to 20,419.28, 30,622.44 and 7,938.44 is: 11,905.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.28 : 30,622.44 = 7,938.44 : x
  2. Step 2: Convert to fraction form
    20,419.28/30,622.44 = 7,938.44/x
  3. Step 3: Cross multiply
    20,419.28x = 30,622.44 × 7,938.44
  4. Step 4: Simplify right side
    20,419.28x = 243,094,402.59
  5. Step 5: Solve for x
    x = 243,094,402.59/20,419.28
  6. Step 6: Final answer
    x = 11,905.14

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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.