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Finding the Fourth Proportional to 654,165.70, 981,248.55 and 430,216.90

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Solution

The fourth proportional to 654,165.70, 981,248.55 and 430,216.90 is: 645,325.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    654,165.70 : 981,248.55 = 430,216.90 : x
  2. Step 2: Convert to fraction form
    654,165.70/981,248.55 = 430,216.90/x
  3. Step 3: Cross multiply
    654,165.70x = 981,248.55 × 430,216.90
  4. Step 4: Simplify right side
    654,165.70x = 422,149,709,310.50
  5. Step 5: Solve for x
    x = 422,149,709,310.50/654,165.70
  6. Step 6: Final answer
    x = 645,325.35

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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.