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Finding the Fourth Proportional to 418,822.20, 628,233.30 and 259,389.90

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Solution

The fourth proportional to 418,822.20, 628,233.30 and 259,389.90 is: 389,084.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,822.20 : 628,233.30 = 259,389.90 : x
  2. Step 2: Convert to fraction form
    418,822.20/628,233.30 = 259,389.90/x
  3. Step 3: Cross multiply
    418,822.20x = 628,233.30 × 259,389.90
  4. Step 4: Simplify right side
    418,822.20x = 162,957,372,863.67
  5. Step 5: Solve for x
    x = 162,957,372,863.67/418,822.20
  6. Step 6: Final answer
    x = 389,084.85

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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.