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Finding the Fourth Proportional to 18,737.67, 28,119.24 and 9,978.72

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Solution

The fourth proportional to 18,737.67, 28,119.24 and 9,978.72 is: 14,974.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,737.67 : 28,119.24 = 9,978.72 : x
  2. Step 2: Convert to fraction form
    18,737.67/28,119.24 = 9,978.72/x
  3. Step 3: Cross multiply
    18,737.67x = 28,119.24 × 9,978.72
  4. Step 4: Simplify right side
    18,737.67x = 280,594,022.57
  5. Step 5: Solve for x
    x = 280,594,022.57/18,737.67
  6. Step 6: Final answer
    x = 14,974.86

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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.