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Finding the Fourth Proportional to 399,347.78, 551,102.60 and 218,060.97

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Solution

The fourth proportional to 399,347.78, 551,102.60 and 218,060.97 is: 300,925.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,347.78 : 551,102.60 = 218,060.97 : x
  2. Step 2: Convert to fraction form
    399,347.78/551,102.60 = 218,060.97/x
  3. Step 3: Cross multiply
    399,347.78x = 551,102.60 × 218,060.97
  4. Step 4: Simplify right side
    399,347.78x = 120,173,963,679.70
  5. Step 5: Solve for x
    x = 120,173,963,679.70/399,347.78
  6. Step 6: Final answer
    x = 300,925.59

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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.