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Finding the Fourth Proportional to 666,021.80, 998,408.18 and 324,390.53

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Solution

The fourth proportional to 666,021.80, 998,408.18 and 324,390.53 is: 486,281.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,021.80 : 998,408.18 = 324,390.53 : x
  2. Step 2: Convert to fraction form
    666,021.80/998,408.18 = 324,390.53/x
  3. Step 3: Cross multiply
    666,021.80x = 998,408.18 × 324,390.53
  4. Step 4: Simplify right side
    666,021.80x = 323,874,152,052.54
  5. Step 5: Solve for x
    x = 323,874,152,052.54/666,021.80
  6. Step 6: Final answer
    x = 486,281.61

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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.