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Finding the Fourth Proportional to 378,081.56, 521,752.12 and 208,315.64

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Solution

The fourth proportional to 378,081.56, 521,752.12 and 208,315.64 is: 287,475.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,081.56 : 521,752.12 = 208,315.64 : x
  2. Step 2: Convert to fraction form
    378,081.56/521,752.12 = 208,315.64/x
  3. Step 3: Cross multiply
    378,081.56x = 521,752.12 × 208,315.64
  4. Step 4: Simplify right side
    378,081.56x = 108,689,126,799.16
  5. Step 5: Solve for x
    x = 108,689,126,799.16/378,081.56
  6. Step 6: Final answer
    x = 287,475.34

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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.