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Finding the Fourth Proportional to 399,561.39, 551,387.76 and 218,268.66

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Solution

The fourth proportional to 399,561.39, 551,387.76 and 218,268.66 is: 301,206.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,561.39 : 551,387.76 = 218,268.66 : x
  2. Step 2: Convert to fraction form
    399,561.39/551,387.76 = 218,268.66/x
  3. Step 3: Cross multiply
    399,561.39x = 551,387.76 × 218,268.66
  4. Step 4: Simplify right side
    399,561.39x = 120,350,667,515.60
  5. Step 5: Solve for x
    x = 120,350,667,515.60/399,561.39
  6. Step 6: Final answer
    x = 301,206.95

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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.