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Finding the Fourth Proportional to 18,920.82, 28,381.23 and 7,815.30

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Solution

The fourth proportional to 18,920.82, 28,381.23 and 7,815.30 is: 11,722.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920.82 : 28,381.23 = 7,815.30 : x
  2. Step 2: Convert to fraction form
    18,920.82/28,381.23 = 7,815.30/x
  3. Step 3: Cross multiply
    18,920.82x = 28,381.23 × 7,815.30
  4. Step 4: Simplify right side
    18,920.82x = 221,807,856.13
  5. Step 5: Solve for x
    x = 221,807,856.13/18,920.82
  6. Step 6: Final answer
    x = 11,722.95

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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.