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Finding the Fourth Proportional to 399,557, 551,388.66 and 220,709

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Solution

The fourth proportional to 399,557, 551,388.66 and 220,709 is: 304,578.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,557 : 551,388.66 = 220,709 : x
  2. Step 2: Convert to fraction form
    399,557/551,388.66 = 220,709/x
  3. Step 3: Cross multiply
    399,557x = 551,388.66 × 220,709
  4. Step 4: Simplify right side
    399,557x = 121,696,439,759.94
  5. Step 5: Solve for x
    x = 121,696,439,759.94/399,557
  6. Step 6: Final answer
    x = 304,578.42

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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.