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Finding the Fourth Proportional to 778,850.40, 1,091,965.20 and 778,850.40

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Solution

The fourth proportional to 778,850.40, 1,091,965.20 and 778,850.40 is: 1,091,965.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,850.40 : 1,091,965.20 = 778,850.40 : x
  2. Step 2: Convert to fraction form
    778,850.40/1,091,965.20 = 778,850.40/x
  3. Step 3: Cross multiply
    778,850.40x = 1,091,965.20 × 778,850.40
  4. Step 4: Simplify right side
    778,850.40x = 850,477,532,806.08
  5. Step 5: Solve for x
    x = 850,477,532,806.08/778,850.40
  6. Step 6: Final answer
    x = 1,091,965.20

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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 (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.