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Finding the Fourth Proportional to 399,463.96, 551,247.78 and 218,173

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Solution

The fourth proportional to 399,463.96, 551,247.78 and 218,173 is: 301,071.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,463.96 : 551,247.78 = 218,173 : x
  2. Step 2: Convert to fraction form
    399,463.96/551,247.78 = 218,173/x
  3. Step 3: Cross multiply
    399,463.96x = 551,247.78 × 218,173
  4. Step 4: Simplify right side
    399,463.96x = 120,267,381,905.94
  5. Step 5: Solve for x
    x = 120,267,381,905.94/399,463.96
  6. Step 6: Final answer
    x = 301,071.92

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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.