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Finding the Fourth Proportional to 399,804.38, 551,742.81 and 218,512.34

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Solution

The fourth proportional to 399,804.38, 551,742.81 and 218,512.34 is: 301,554.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,804.38 : 551,742.81 = 218,512.34 : x
  2. Step 2: Convert to fraction form
    399,804.38/551,742.81 = 218,512.34/x
  3. Step 3: Cross multiply
    399,804.38x = 551,742.81 × 218,512.34
  4. Step 4: Simplify right side
    399,804.38x = 120,562,612,491.28
  5. Step 5: Solve for x
    x = 120,562,612,491.28/399,804.38
  6. Step 6: Final answer
    x = 301,554.01

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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.