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Finding the Fourth Proportional to 399,066, 550,711.80 and 220,218

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Solution

The fourth proportional to 399,066, 550,711.80 and 220,218 is: 303,901.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,066 : 550,711.80 = 220,218 : x
  2. Step 2: Convert to fraction form
    399,066/550,711.80 = 220,218/x
  3. Step 3: Cross multiply
    399,066x = 550,711.80 × 220,218
  4. Step 4: Simplify right side
    399,066x = 121,276,651,172.40
  5. Step 5: Solve for x
    x = 121,276,651,172.40/399,066
  6. Step 6: Final answer
    x = 303,901.24

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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.