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Finding the Fourth Proportional to 391,003.50, 539,593.04 and 221,237.63

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Solution

The fourth proportional to 391,003.50, 539,593.04 and 221,237.63 is: 305,312.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,003.50 : 539,593.04 = 221,237.63 : x
  2. Step 2: Convert to fraction form
    391,003.50/539,593.04 = 221,237.63/x
  3. Step 3: Cross multiply
    391,003.50x = 539,593.04 × 221,237.63
  4. Step 4: Simplify right side
    391,003.50x = 119,378,285,212.70
  5. Step 5: Solve for x
    x = 119,378,285,212.70/391,003.50
  6. Step 6: Final answer
    x = 305,312.57

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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.