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Finding the Fourth Proportional to 378,078.82, 521,750.40 and 208,312.96

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Solution

The fourth proportional to 378,078.82, 521,750.40 and 208,312.96 is: 287,472.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,078.82 : 521,750.40 = 208,312.96 : x
  2. Step 2: Convert to fraction form
    378,078.82/521,750.40 = 208,312.96/x
  3. Step 3: Cross multiply
    378,078.82x = 521,750.40 × 208,312.96
  4. Step 4: Simplify right side
    378,078.82x = 108,687,370,205.18
  5. Step 5: Solve for x
    x = 108,687,370,205.18/378,078.82
  6. Step 6: Final answer
    x = 287,472.78

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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.