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Finding the Fourth Proportional to 445,818.57, 668,836.77 and 142,212.78

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Solution

The fourth proportional to 445,818.57, 668,836.77 and 142,212.78 is: 213,353.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,818.57 : 668,836.77 = 142,212.78 : x
  2. Step 2: Convert to fraction form
    445,818.57/668,836.77 = 142,212.78/x
  3. Step 3: Cross multiply
    445,818.57x = 668,836.77 × 142,212.78
  4. Step 4: Simplify right side
    445,818.57x = 95,117,136,427.92
  5. Step 5: Solve for x
    x = 95,117,136,427.92/445,818.57
  6. Step 6: Final answer
    x = 213,353.91

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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.