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Finding the Fourth Proportional to 18,839.78, 28,240.52 and 8,315.52

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Solution

The fourth proportional to 18,839.78, 28,240.52 and 8,315.52 is: 12,464.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,839.78 : 28,240.52 = 8,315.52 : x
  2. Step 2: Convert to fraction form
    18,839.78/28,240.52 = 8,315.52/x
  3. Step 3: Cross multiply
    18,839.78x = 28,240.52 × 8,315.52
  4. Step 4: Simplify right side
    18,839.78x = 234,834,567.29
  5. Step 5: Solve for x
    x = 234,834,567.29/18,839.78
  6. Step 6: Final answer
    x = 12,464.83

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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.