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Finding the Fourth Proportional to 18,991.85, 28,451.18 and 10,646.52

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Solution

The fourth proportional to 18,991.85, 28,451.18 and 10,646.52 is: 15,949.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.85 : 28,451.18 = 10,646.52 : x
  2. Step 2: Convert to fraction form
    18,991.85/28,451.18 = 10,646.52/x
  3. Step 3: Cross multiply
    18,991.85x = 28,451.18 × 10,646.52
  4. Step 4: Simplify right side
    18,991.85x = 302,906,003.66
  5. Step 5: Solve for x
    x = 302,906,003.66/18,991.85
  6. Step 6: Final answer
    x = 15,949.27

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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.