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Finding the Fourth Proportional to 399,376.78, 551,119.41 and 218,053.76

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Solution

The fourth proportional to 399,376.78, 551,119.41 and 218,053.76 is: 300,902.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,376.78 : 551,119.41 = 218,053.76 : x
  2. Step 2: Convert to fraction form
    399,376.78/551,119.41 = 218,053.76/x
  3. Step 3: Cross multiply
    399,376.78x = 551,119.41 × 218,053.76
  4. Step 4: Simplify right side
    399,376.78x = 120,173,656,803.89
  5. Step 5: Solve for x
    x = 120,173,656,803.89/399,376.78
  6. Step 6: Final answer
    x = 300,902.97

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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.