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Finding the Fourth Proportional to 399,331.19, 551,078.17 and 218,044.67

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Solution

The fourth proportional to 399,331.19, 551,078.17 and 218,044.67 is: 300,902.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,331.19 : 551,078.17 = 218,044.67 : x
  2. Step 2: Convert to fraction form
    399,331.19/551,078.17 = 218,044.67/x
  3. Step 3: Cross multiply
    399,331.19x = 551,078.17 × 218,044.67
  4. Step 4: Simplify right side
    399,331.19x = 120,159,654,421.35
  5. Step 5: Solve for x
    x = 120,159,654,421.35/399,331.19
  6. Step 6: Final answer
    x = 300,902.26

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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.