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Finding the Fourth Proportional to 654,138.80, 981,208.20 and 654,138.80

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Solution

The fourth proportional to 654,138.80, 981,208.20 and 654,138.80 is: 981,208.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,138.80 : 981,208.20 = 654,138.80 : x
  2. Step 2: Convert to fraction form
    654,138.80/981,208.20 = 654,138.80/x
  3. Step 3: Cross multiply
    654,138.80x = 981,208.20 × 654,138.80
  4. Step 4: Simplify right side
    654,138.80x = 641,846,354,498.16
  5. Step 5: Solve for x
    x = 641,846,354,498.16/654,138.80
  6. Step 6: Final answer
    x = 981,208.20

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Double scale
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Similar ratio
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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.