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Finding the Fourth Proportional to 819,446.80, 1,229,170.20 and 778,896.40

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Solution

The fourth proportional to 819,446.80, 1,229,170.20 and 778,896.40 is: 1,168,344.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,446.80 : 1,229,170.20 = 778,896.40 : x
  2. Step 2: Convert to fraction form
    819,446.80/1,229,170.20 = 778,896.40/x
  3. Step 3: Cross multiply
    819,446.80x = 1,229,170.20 × 778,896.40
  4. Step 4: Simplify right side
    819,446.80x = 957,396,243,767.28
  5. Step 5: Solve for x
    x = 957,396,243,767.28/819,446.80
  6. Step 6: Final answer
    x = 1,168,344.60

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Double scale
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Similar ratio
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1.5x scale

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.