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Finding the Fourth Proportional to 20,491.20, 30,679.20 and 19,915.20

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Solution

The fourth proportional to 20,491.20, 30,679.20 and 19,915.20 is: 29,816.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.20 : 30,679.20 = 19,915.20 : x
  2. Step 2: Convert to fraction form
    20,491.20/30,679.20 = 19,915.20/x
  3. Step 3: Cross multiply
    20,491.20x = 30,679.20 × 19,915.20
  4. Step 4: Simplify right side
    20,491.20x = 610,982,403.84
  5. Step 5: Solve for x
    x = 610,982,403.84/20,491.20
  6. Step 6: Final answer
    x = 29,816.82

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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.