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Finding the Fourth Proportional to 391,042.52, 539,650.04 and 221,273

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Solution

The fourth proportional to 391,042.52, 539,650.04 and 221,273 is: 305,363.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,042.52 : 539,650.04 = 221,273 : x
  2. Step 2: Convert to fraction form
    391,042.52/539,650.04 = 221,273/x
  3. Step 3: Cross multiply
    391,042.52x = 539,650.04 × 221,273
  4. Step 4: Simplify right side
    391,042.52x = 119,409,983,300.92
  5. Step 5: Solve for x
    x = 119,409,983,300.92/391,042.52
  6. Step 6: Final answer
    x = 305,363.17

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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.