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Finding the Fourth Proportional to 399,498.31, 551,304.39 and 218,210.36

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Solution

The fourth proportional to 399,498.31, 551,304.39 and 218,210.36 is: 301,128.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,498.31 : 551,304.39 = 218,210.36 : x
  2. Step 2: Convert to fraction form
    399,498.31/551,304.39 = 218,210.36/x
  3. Step 3: Cross multiply
    399,498.31x = 551,304.39 × 218,210.36
  4. Step 4: Simplify right side
    399,498.31x = 120,300,327,473.25
  5. Step 5: Solve for x
    x = 120,300,327,473.25/399,498.31
  6. Step 6: Final answer
    x = 301,128.50

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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.