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Finding the Fourth Proportional to 399,326.31, 551,071.44 and 218,039.79

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Solution

The fourth proportional to 399,326.31, 551,071.44 and 218,039.79 is: 300,895.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,326.31 : 551,071.44 = 218,039.79 : x
  2. Step 2: Convert to fraction form
    399,326.31/551,071.44 = 218,039.79/x
  3. Step 3: Cross multiply
    399,326.31x = 551,071.44 × 218,039.79
  4. Step 4: Simplify right side
    399,326.31x = 120,155,501,052.60
  5. Step 5: Solve for x
    x = 120,155,501,052.60/399,326.31
  6. Step 6: Final answer
    x = 300,895.53

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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.