Home / 18,781.20-28,154.79-7,091.28

Finding the Fourth Proportional to 18,781.20, 28,154.79 and 7,091.28

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Solution

The fourth proportional to 18,781.20, 28,154.79 and 7,091.28 is: 10,630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.20 : 28,154.79 = 7,091.28 : x
  2. Step 2: Convert to fraction form
    18,781.20/28,154.79 = 7,091.28/x
  3. Step 3: Cross multiply
    18,781.20x = 28,154.79 × 7,091.28
  4. Step 4: Simplify right side
    18,781.20x = 199,653,499.23
  5. Step 5: Solve for x
    x = 199,653,499.23/18,781.20
  6. Step 6: Final answer
    x = 10,630.50

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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.