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Finding the Fourth Proportional to 378,480.18, 522,278.79 and 217,221.72

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Solution

The fourth proportional to 378,480.18, 522,278.79 and 217,221.72 is: 299,752.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,480.18 : 522,278.79 = 217,221.72 : x
  2. Step 2: Convert to fraction form
    378,480.18/522,278.79 = 217,221.72/x
  3. Step 3: Cross multiply
    378,480.18x = 522,278.79 × 217,221.72
  4. Step 4: Simplify right side
    378,480.18x = 113,450,297,083.32
  5. Step 5: Solve for x
    x = 113,450,297,083.32/378,480.18
  6. Step 6: Final answer
    x = 299,752.28

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1.5x scale

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.