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Finding the Fourth Proportional to 399,317.28, 551,053.65 and 218,028.64

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Solution

The fourth proportional to 399,317.28, 551,053.65 and 218,028.64 is: 300,877.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,317.28 : 551,053.65 = 218,028.64 : x
  2. Step 2: Convert to fraction form
    399,317.28/551,053.65 = 218,028.64/x
  3. Step 3: Cross multiply
    399,317.28x = 551,053.65 × 218,028.64
  4. Step 4: Simplify right side
    399,317.28x = 120,145,477,876.54
  5. Step 5: Solve for x
    x = 120,145,477,876.54/399,317.28
  6. Step 6: Final answer
    x = 300,877.23

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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.