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Finding the Fourth Proportional to 391,049.02, 539,659.02 and 221,279.50

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Solution

The fourth proportional to 391,049.02, 539,659.02 and 221,279.50 is: 305,372.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,049.02 : 539,659.02 = 221,279.50 : x
  2. Step 2: Convert to fraction form
    391,049.02/539,659.02 = 221,279.50/x
  3. Step 3: Cross multiply
    391,049.02x = 539,659.02 × 221,279.50
  4. Step 4: Simplify right side
    391,049.02x = 119,415,478,116.09
  5. Step 5: Solve for x
    x = 119,415,478,116.09/391,049.02
  6. Step 6: Final answer
    x = 305,372.15

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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.