Home / 18,920.07-28,380.11-7,814.55

Finding the Fourth Proportional to 18,920.07, 28,380.11 and 7,814.55

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Solution

The fourth proportional to 18,920.07, 28,380.11 and 7,814.55 is: 11,721.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920.07 : 28,380.11 = 7,814.55 : x
  2. Step 2: Convert to fraction form
    18,920.07/28,380.11 = 7,814.55/x
  3. Step 3: Cross multiply
    18,920.07x = 28,380.11 × 7,814.55
  4. Step 4: Simplify right side
    18,920.07x = 221,777,809.10
  5. Step 5: Solve for x
    x = 221,777,809.10/18,920.07
  6. Step 6: Final answer
    x = 11,721.83

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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.