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Finding the Fourth Proportional to 391,160.10, 539,708.40 and 221,394.22

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Solution

The fourth proportional to 391,160.10, 539,708.40 and 221,394.22 is: 305,471.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,160.10 : 539,708.40 = 221,394.22 : x
  2. Step 2: Convert to fraction form
    391,160.10/539,708.40 = 221,394.22/x
  3. Step 3: Cross multiply
    391,160.10x = 539,708.40 × 221,394.22
  4. Step 4: Simplify right side
    391,160.10x = 119,488,320,245.45
  5. Step 5: Solve for x
    x = 119,488,320,245.45/391,160.10
  6. Step 6: Final answer
    x = 305,471.65

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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.