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Finding the Fourth Proportional to 927,979.80, 1,391,969.70 and 815,786.70

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Solution

The fourth proportional to 927,979.80, 1,391,969.70 and 815,786.70 is: 1,223,680.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    927,979.80 : 1,391,969.70 = 815,786.70 : x
  2. Step 2: Convert to fraction form
    927,979.80/1,391,969.70 = 815,786.70/x
  3. Step 3: Cross multiply
    927,979.80x = 1,391,969.70 × 815,786.70
  4. Step 4: Simplify right side
    927,979.80x = 1,135,550,368,062.99
  5. Step 5: Solve for x
    x = 1,135,550,368,062.99/927,979.80
  6. Step 6: Final answer
    x = 1,223,680.05

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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.