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Finding the Fourth Proportional to 18,781.19, 28,169.96 and 4,930.19

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Solution

The fourth proportional to 18,781.19, 28,169.96 and 4,930.19 is: 7,394.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.19 : 28,169.96 = 4,930.19 : x
  2. Step 2: Convert to fraction form
    18,781.19/28,169.96 = 4,930.19/x
  3. Step 3: Cross multiply
    18,781.19x = 28,169.96 × 4,930.19
  4. Step 4: Simplify right side
    18,781.19x = 138,883,300.87
  5. Step 5: Solve for x
    x = 138,883,300.87/18,781.19
  6. Step 6: Final answer
    x = 7,394.81

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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.