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Finding the Fourth Proportional to 18,843.48, 28,265.84 and 9,478.40

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Solution

The fourth proportional to 18,843.48, 28,265.84 and 9,478.40 is: 14,217.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,843.48 : 28,265.84 = 9,478.40 : x
  2. Step 2: Convert to fraction form
    18,843.48/28,265.84 = 9,478.40/x
  3. Step 3: Cross multiply
    18,843.48x = 28,265.84 × 9,478.40
  4. Step 4: Simplify right side
    18,843.48x = 267,914,937.86
  5. Step 5: Solve for x
    x = 267,914,937.86/18,843.48
  6. Step 6: Final answer
    x = 14,217.91

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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.