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Finding the Fourth Proportional to 391,079, 539,689.02 and 212,231

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Solution

The fourth proportional to 391,079, 539,689.02 and 212,231 is: 292,878.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,079 : 539,689.02 = 212,231 : x
  2. Step 2: Convert to fraction form
    391,079/539,689.02 = 212,231/x
  3. Step 3: Cross multiply
    391,079x = 539,689.02 × 212,231
  4. Step 4: Simplify right side
    391,079x = 114,538,740,403.62
  5. Step 5: Solve for x
    x = 114,538,740,403.62/391,079
  6. Step 6: Final answer
    x = 292,878.78

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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.