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Finding the Fourth Proportional to 289,469.12, 399,462.72 and 162,143.68

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Solution

The fourth proportional to 289,469.12, 399,462.72 and 162,143.68 is: 223,755.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,469.12 : 399,462.72 = 162,143.68 : x
  2. Step 2: Convert to fraction form
    289,469.12/399,462.72 = 162,143.68/x
  3. Step 3: Cross multiply
    289,469.12x = 399,462.72 × 162,143.68
  4. Step 4: Simplify right side
    289,469.12x = 64,770,355,443.61
  5. Step 5: Solve for x
    x = 64,770,355,443.61/289,469.12
  6. Step 6: Final answer
    x = 223,755.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.