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Finding the Fourth Proportional to 399,897.55, 551,859.72 and 218,611.66

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Solution

The fourth proportional to 399,897.55, 551,859.72 and 218,611.66 is: 301,684.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,897.55 : 551,859.72 = 218,611.66 : x
  2. Step 2: Convert to fraction form
    399,897.55/551,859.72 = 218,611.66/x
  3. Step 3: Cross multiply
    399,897.55x = 551,859.72 × 218,611.66
  4. Step 4: Simplify right side
    399,897.55x = 120,642,969,476.34
  5. Step 5: Solve for x
    x = 120,642,969,476.34/399,897.55
  6. Step 6: Final answer
    x = 301,684.69

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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.