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Finding the Fourth Proportional to 399,791.30, 551,712 and 218,503.22

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Solution

The fourth proportional to 399,791.30, 551,712 and 218,503.22 is: 301,534.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,791.30 : 551,712 = 218,503.22 : x
  2. Step 2: Convert to fraction form
    399,791.30/551,712 = 218,503.22/x
  3. Step 3: Cross multiply
    399,791.30x = 551,712 × 218,503.22
  4. Step 4: Simplify right side
    399,791.30x = 120,550,845,754.08
  5. Step 5: Solve for x
    x = 120,550,845,754.08/399,791.30
  6. Step 6: Final answer
    x = 301,534.44

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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.