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Finding the Fourth Proportional to 654,425.80, 981,638.70 and 442,918.60

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Solution

The fourth proportional to 654,425.80, 981,638.70 and 442,918.60 is: 664,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,425.80 : 981,638.70 = 442,918.60 : x
  2. Step 2: Convert to fraction form
    654,425.80/981,638.70 = 442,918.60/x
  3. Step 3: Cross multiply
    654,425.80x = 981,638.70 × 442,918.60
  4. Step 4: Simplify right side
    654,425.80x = 434,786,038,709.82
  5. Step 5: Solve for x
    x = 434,786,038,709.82/654,425.80
  6. Step 6: Final answer
    x = 664,377.90

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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.