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Finding the Fourth Proportional to 391,053.20, 539,653.40 and 212,205.20

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Solution

The fourth proportional to 391,053.20, 539,653.40 and 212,205.20 is: 292,843.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,053.20 : 539,653.40 = 212,205.20 : x
  2. Step 2: Convert to fraction form
    391,053.20/539,653.40 = 212,205.20/x
  3. Step 3: Cross multiply
    391,053.20x = 539,653.40 × 212,205.20
  4. Step 4: Simplify right side
    391,053.20x = 114,517,253,918.39
  5. Step 5: Solve for x
    x = 114,517,253,918.39/391,053.20
  6. Step 6: Final answer
    x = 292,843.16

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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.