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Finding the Fourth Proportional to 18,785.52, 28,156.32 and 9,420.48

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Solution

The fourth proportional to 18,785.52, 28,156.32 and 9,420.48 is: 14,119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.52 : 28,156.32 = 9,420.48 : x
  2. Step 2: Convert to fraction form
    18,785.52/28,156.32 = 9,420.48/x
  3. Step 3: Cross multiply
    18,785.52x = 28,156.32 × 9,420.48
  4. Step 4: Simplify right side
    18,785.52x = 265,246,049.43
  5. Step 5: Solve for x
    x = 265,246,049.43/18,785.52
  6. Step 6: Final answer
    x = 14,119.71

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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.