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Finding the Fourth Proportional to 653,105.80, 979,658.70 and 485,144.20

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Solution

The fourth proportional to 653,105.80, 979,658.70 and 485,144.20 is: 727,716.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    653,105.80 : 979,658.70 = 485,144.20 : x
  2. Step 2: Convert to fraction form
    653,105.80/979,658.70 = 485,144.20/x
  3. Step 3: Cross multiply
    653,105.80x = 979,658.70 × 485,144.20
  4. Step 4: Simplify right side
    653,105.80x = 475,275,736,284.54
  5. Step 5: Solve for x
    x = 475,275,736,284.54/653,105.80
  6. Step 6: Final answer
    x = 727,716.30

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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.