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Finding the Fourth Proportional to 399,681.44, 551,543.22 and 218,390.48

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Solution

The fourth proportional to 399,681.44, 551,543.22 and 218,390.48 is: 301,369.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,681.44 : 551,543.22 = 218,390.48 : x
  2. Step 2: Convert to fraction form
    399,681.44/551,543.22 = 218,390.48/x
  3. Step 3: Cross multiply
    399,681.44x = 551,543.22 × 218,390.48
  4. Step 4: Simplify right side
    399,681.44x = 120,451,788,556.55
  5. Step 5: Solve for x
    x = 120,451,788,556.55/399,681.44
  6. Step 6: Final answer
    x = 301,369.48

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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.