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Finding the Fourth Proportional to 654,107.70, 981,161.55 and 430,158.90

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Solution

The fourth proportional to 654,107.70, 981,161.55 and 430,158.90 is: 645,238.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,107.70 : 981,161.55 = 430,158.90 : x
  2. Step 2: Convert to fraction form
    654,107.70/981,161.55 = 430,158.90/x
  3. Step 3: Cross multiply
    654,107.70x = 981,161.55 × 430,158.90
  4. Step 4: Simplify right side
    654,107.70x = 422,055,373,070.30
  5. Step 5: Solve for x
    x = 422,055,373,070.30/654,107.70
  6. Step 6: Final answer
    x = 645,238.35

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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.