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Finding the Fourth Proportional to 18,954.86, 28,432.31 and 7,854.12

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Solution

The fourth proportional to 18,954.86, 28,432.31 and 7,854.12 is: 11,781.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.86 : 28,432.31 = 7,854.12 : x
  2. Step 2: Convert to fraction form
    18,954.86/28,432.31 = 7,854.12/x
  3. Step 3: Cross multiply
    18,954.86x = 28,432.31 × 7,854.12
  4. Step 4: Simplify right side
    18,954.86x = 223,310,735.35
  5. Step 5: Solve for x
    x = 223,310,735.35/18,954.86
  6. Step 6: Final answer
    x = 11,781.19

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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.