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Finding the Fourth Proportional to 402,809.20, 555,863.96 and 221,520.56

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Solution

The fourth proportional to 402,809.20, 555,863.96 and 221,520.56 is: 305,691.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,809.20 : 555,863.96 = 221,520.56 : x
  2. Step 2: Convert to fraction form
    402,809.20/555,863.96 = 221,520.56/x
  3. Step 3: Cross multiply
    402,809.20x = 555,863.96 × 221,520.56
  4. Step 4: Simplify right side
    402,809.20x = 123,135,293,477.50
  5. Step 5: Solve for x
    x = 123,135,293,477.50/402,809.20
  6. Step 6: Final answer
    x = 305,691.37

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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.