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Finding the Fourth Proportional to 285,453.45, 393,930.50 and 156,390.03

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Solution

The fourth proportional to 285,453.45, 393,930.50 and 156,390.03 is: 215,820.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,453.45 : 393,930.50 = 156,390.03 : x
  2. Step 2: Convert to fraction form
    285,453.45/393,930.50 = 156,390.03/x
  3. Step 3: Cross multiply
    285,453.45x = 393,930.50 × 156,390.03
  4. Step 4: Simplify right side
    285,453.45x = 61,606,801,930.96
  5. Step 5: Solve for x
    x = 61,606,801,930.96/285,453.45
  6. Step 6: Final answer
    x = 215,820.83

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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.