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Finding the Fourth Proportional to 820,624.60, 1,230,245.70 and 426,640.60

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Solution

The fourth proportional to 820,624.60, 1,230,245.70 and 426,640.60 is: 639,601.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,624.60 : 1,230,245.70 = 426,640.60 : x
  2. Step 2: Convert to fraction form
    820,624.60/1,230,245.70 = 426,640.60/x
  3. Step 3: Cross multiply
    820,624.60x = 1,230,245.70 × 426,640.60
  4. Step 4: Simplify right side
    820,624.60x = 524,872,763,595.42
  5. Step 5: Solve for x
    x = 524,872,763,595.42/820,624.60
  6. Step 6: Final answer
    x = 639,601.55

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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.