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Finding the Fourth Proportional to 391,160.72, 539,709.21 and 221,394.84

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Solution

The fourth proportional to 391,160.72, 539,709.21 and 221,394.84 is: 305,472.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,160.72 : 539,709.21 = 221,394.84 : x
  2. Step 2: Convert to fraction form
    391,160.72/539,709.21 = 221,394.84/x
  3. Step 3: Cross multiply
    391,160.72x = 539,709.21 × 221,394.84
  4. Step 4: Simplify right side
    391,160.72x = 119,488,834,194.48
  5. Step 5: Solve for x
    x = 119,488,834,194.48/391,160.72
  6. Step 6: Final answer
    x = 305,472.48

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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.