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Finding the Fourth Proportional to 399,411.94, 551,192.86 and 218,129.20

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Solution

The fourth proportional to 399,411.94, 551,192.86 and 218,129.20 is: 301,020.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,411.94 : 551,192.86 = 218,129.20 : x
  2. Step 2: Convert to fraction form
    399,411.94/551,192.86 = 218,129.20/x
  3. Step 3: Cross multiply
    399,411.94x = 551,192.86 × 218,129.20
  4. Step 4: Simplify right side
    399,411.94x = 120,231,257,597.51
  5. Step 5: Solve for x
    x = 120,231,257,597.51/399,411.94
  6. Step 6: Final answer
    x = 301,020.69

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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.