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Finding the Fourth Proportional to 815,579.80, 1,221,036.90 and 815,579.80

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Solution

The fourth proportional to 815,579.80, 1,221,036.90 and 815,579.80 is: 1,221,036.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,579.80 : 1,221,036.90 = 815,579.80 : x
  2. Step 2: Convert to fraction form
    815,579.80/1,221,036.90 = 815,579.80/x
  3. Step 3: Cross multiply
    815,579.80x = 1,221,036.90 × 815,579.80
  4. Step 4: Simplify right side
    815,579.80x = 995,853,030,694.62
  5. Step 5: Solve for x
    x = 995,853,030,694.62/815,579.80
  6. Step 6: Final answer
    x = 1,221,036.90

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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.