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Finding the Fourth Proportional to 399,317.21, 551,053.57 and 218,028.58

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Solution

The fourth proportional to 399,317.21, 551,053.57 and 218,028.58 is: 300,877.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,317.21 : 551,053.57 = 218,028.58 : x
  2. Step 2: Convert to fraction form
    399,317.21/551,053.57 = 218,028.58/x
  3. Step 3: Cross multiply
    399,317.21x = 551,053.57 × 218,028.58
  4. Step 4: Simplify right side
    399,317.21x = 120,145,427,371.03
  5. Step 5: Solve for x
    x = 120,145,427,371.03/399,317.21
  6. Step 6: Final answer
    x = 300,877.16

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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.