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Finding the Fourth Proportional to 399,638.82, 551,495.06 and 218,346.85

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Solution

The fourth proportional to 399,638.82, 551,495.06 and 218,346.85 is: 301,315.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,638.82 : 551,495.06 = 218,346.85 : x
  2. Step 2: Convert to fraction form
    399,638.82/551,495.06 = 218,346.85/x
  3. Step 3: Cross multiply
    399,638.82x = 551,495.06 × 218,346.85
  4. Step 4: Simplify right side
    399,638.82x = 120,417,207,392.82
  5. Step 5: Solve for x
    x = 120,417,207,392.82/399,638.82
  6. Step 6: Final answer
    x = 301,315.09

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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.