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Finding the Fourth Proportional to 18,998.80, 28,498.20 and 5,147.80

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Solution

The fourth proportional to 18,998.80, 28,498.20 and 5,147.80 is: 7,721.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,998.80 : 28,498.20 = 5,147.80 : x
  2. Step 2: Convert to fraction form
    18,998.80/28,498.20 = 5,147.80/x
  3. Step 3: Cross multiply
    18,998.80x = 28,498.20 × 5,147.80
  4. Step 4: Simplify right side
    18,998.80x = 146,703,033.96
  5. Step 5: Solve for x
    x = 146,703,033.96/18,998.80
  6. Step 6: Final answer
    x = 7,721.70

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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.