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Finding the Fourth Proportional to 815,629.80, 1,221,111.90 and 815,629.80

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Solution

The fourth proportional to 815,629.80, 1,221,111.90 and 815,629.80 is: 1,221,111.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,629.80 : 1,221,111.90 = 815,629.80 : x
  2. Step 2: Convert to fraction form
    815,629.80/1,221,111.90 = 815,629.80/x
  3. Step 3: Cross multiply
    815,629.80x = 1,221,111.90 × 815,629.80
  4. Step 4: Simplify right side
    815,629.80x = 995,975,254,774.62
  5. Step 5: Solve for x
    x = 995,975,254,774.62/815,629.80
  6. Step 6: Final answer
    x = 1,221,111.90

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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.