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Finding the Fourth Proportional to 18,691.20, 28,036.17 and 4,651.20

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Solution

The fourth proportional to 18,691.20, 28,036.17 and 4,651.20 is: 6,976.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.20 : 28,036.17 = 4,651.20 : x
  2. Step 2: Convert to fraction form
    18,691.20/28,036.17 = 4,651.20/x
  3. Step 3: Cross multiply
    18,691.20x = 28,036.17 × 4,651.20
  4. Step 4: Simplify right side
    18,691.20x = 130,401,833.90
  5. Step 5: Solve for x
    x = 130,401,833.90/18,691.20
  6. Step 6: Final answer
    x = 6,976.64

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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.