Home / 18,921.20-28,381.80-7,815.68

Finding the Fourth Proportional to 18,921.20, 28,381.80 and 7,815.68

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Solution

The fourth proportional to 18,921.20, 28,381.80 and 7,815.68 is: 11,723.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.20 : 28,381.80 = 7,815.68 : x
  2. Step 2: Convert to fraction form
    18,921.20/28,381.80 = 7,815.68/x
  3. Step 3: Cross multiply
    18,921.20x = 28,381.80 × 7,815.68
  4. Step 4: Simplify right side
    18,921.20x = 221,822,924.72
  5. Step 5: Solve for x
    x = 221,822,924.72/18,921.20
  6. Step 6: Final answer
    x = 11,723.52

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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.