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Finding the Fourth Proportional to 418,479.75, 627,719.93 and 137,997

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Solution

The fourth proportional to 418,479.75, 627,719.93 and 137,997 is: 206,995.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,479.75 : 627,719.93 = 137,997 : x
  2. Step 2: Convert to fraction form
    418,479.75/627,719.93 = 137,997/x
  3. Step 3: Cross multiply
    418,479.75x = 627,719.93 × 137,997
  4. Step 4: Simplify right side
    418,479.75x = 86,623,467,007.71
  5. Step 5: Solve for x
    x = 86,623,467,007.71/418,479.75
  6. Step 6: Final answer
    x = 206,995.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.