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Finding the Fourth Proportional to 778,855.90, 1,091,972.90 and 778,855.90

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Solution

The fourth proportional to 778,855.90, 1,091,972.90 and 778,855.90 is: 1,091,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,855.90 : 1,091,972.90 = 778,855.90 : x
  2. Step 2: Convert to fraction form
    778,855.90/1,091,972.90 = 778,855.90/x
  3. Step 3: Cross multiply
    778,855.90x = 1,091,972.90 × 778,855.90
  4. Step 4: Simplify right side
    778,855.90x = 850,489,535,805.11
  5. Step 5: Solve for x
    x = 850,489,535,805.11/778,855.90
  6. Step 6: Final answer
    x = 1,091,972.90

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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.