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Finding the Fourth Proportional to 18,887.82, 28,335.12 and 7,788.32

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Solution

The fourth proportional to 18,887.82, 28,335.12 and 7,788.32 is: 11,683.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,887.82 : 28,335.12 = 7,788.32 : x
  2. Step 2: Convert to fraction form
    18,887.82/28,335.12 = 7,788.32/x
  3. Step 3: Cross multiply
    18,887.82x = 28,335.12 × 7,788.32
  4. Step 4: Simplify right side
    18,887.82x = 220,682,981.80
  5. Step 5: Solve for x
    x = 220,682,981.80/18,887.82
  6. Step 6: Final answer
    x = 11,683.88

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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.