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Finding the Fourth Proportional to 391,053.38, 539,653.66 and 212,205.38

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Solution

The fourth proportional to 391,053.38, 539,653.66 and 212,205.38 is: 292,843.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,053.38 : 539,653.66 = 212,205.38 : x
  2. Step 2: Convert to fraction form
    391,053.38/539,653.66 = 212,205.38/x
  3. Step 3: Cross multiply
    391,053.38x = 539,653.66 × 212,205.38
  4. Step 4: Simplify right side
    391,053.38x = 114,517,406,759.91
  5. Step 5: Solve for x
    x = 114,517,406,759.91/391,053.38
  6. Step 6: Final answer
    x = 292,843.42

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1.5x scale

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.