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Finding the Fourth Proportional to 479,177.40, 717,815.70 and 420,079.80

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Solution

The fourth proportional to 479,177.40, 717,815.70 and 420,079.80 is: 629,286.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,177.40 : 717,815.70 = 420,079.80 : x
  2. Step 2: Convert to fraction form
    479,177.40/717,815.70 = 420,079.80/x
  3. Step 3: Cross multiply
    479,177.40x = 717,815.70 × 420,079.80
  4. Step 4: Simplify right side
    479,177.40x = 301,539,875,692.86
  5. Step 5: Solve for x
    x = 301,539,875,692.86/479,177.40
  6. Step 6: Final answer
    x = 629,286.51

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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.