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Finding the Fourth Proportional to 378,880.80, 522,818.28 and 209,103.96

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Solution

The fourth proportional to 378,880.80, 522,818.28 and 209,103.96 is: 288,542.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,880.80 : 522,818.28 = 209,103.96 : x
  2. Step 2: Convert to fraction form
    378,880.80/522,818.28 = 209,103.96/x
  3. Step 3: Cross multiply
    378,880.80x = 522,818.28 × 209,103.96
  4. Step 4: Simplify right side
    378,880.80x = 109,323,372,708.39
  5. Step 5: Solve for x
    x = 109,323,372,708.39/378,880.80
  6. Step 6: Final answer
    x = 288,542.92

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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.