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Finding the Fourth Proportional to 18,961.48, 28,419.15 and 13,416.42

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Solution

The fourth proportional to 18,961.48, 28,419.15 and 13,416.42 is: 20,108.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.48 : 28,419.15 = 13,416.42 : x
  2. Step 2: Convert to fraction form
    18,961.48/28,419.15 = 13,416.42/x
  3. Step 3: Cross multiply
    18,961.48x = 28,419.15 × 13,416.42
  4. Step 4: Simplify right side
    18,961.48x = 381,283,252.44
  5. Step 5: Solve for x
    x = 381,283,252.44/18,961.48
  6. Step 6: Final answer
    x = 20,108.31

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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.