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Finding the Fourth Proportional to 399,329.76, 551,097.35 and 218,058.51

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Solution

The fourth proportional to 399,329.76, 551,097.35 and 218,058.51 is: 300,932.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,329.76 : 551,097.35 = 218,058.51 : x
  2. Step 2: Convert to fraction form
    399,329.76/551,097.35 = 218,058.51/x
  3. Step 3: Cross multiply
    399,329.76x = 551,097.35 × 218,058.51
  4. Step 4: Simplify right side
    399,329.76x = 120,171,467,005.95
  5. Step 5: Solve for x
    x = 120,171,467,005.95/399,329.76
  6. Step 6: Final answer
    x = 300,932.91

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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.