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Finding the Fourth Proportional to 800,436.60, 1,200,834 and 421,535.70

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Solution

The fourth proportional to 800,436.60, 1,200,834 and 421,535.70 is: 632,397.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    800,436.60 : 1,200,834 = 421,535.70 : x
  2. Step 2: Convert to fraction form
    800,436.60/1,200,834 = 421,535.70/x
  3. Step 3: Cross multiply
    800,436.60x = 1,200,834 × 421,535.70
  4. Step 4: Simplify right side
    800,436.60x = 506,194,400,773.80
  5. Step 5: Solve for x
    x = 506,194,400,773.80/800,436.60
  6. Step 6: Final answer
    x = 632,397.87

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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.