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Finding the Fourth Proportional to 639,240.31, 959,016.53 and 212,775.31

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Solution

The fourth proportional to 639,240.31, 959,016.53 and 212,775.31 is: 319,214.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,240.31 : 959,016.53 = 212,775.31 : x
  2. Step 2: Convert to fraction form
    639,240.31/959,016.53 = 212,775.31/x
  3. Step 3: Cross multiply
    639,240.31x = 959,016.53 × 212,775.31
  4. Step 4: Simplify right side
    639,240.31x = 204,055,039,465.87
  5. Step 5: Solve for x
    x = 204,055,039,465.87/639,240.31
  6. Step 6: Final answer
    x = 319,214.91

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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.