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Finding the Fourth Proportional to 778,866.90, 1,091,988.30 and 778,866.90

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Solution

The fourth proportional to 778,866.90, 1,091,988.30 and 778,866.90 is: 1,091,988.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,866.90 : 1,091,988.30 = 778,866.90 : x
  2. Step 2: Convert to fraction form
    778,866.90/1,091,988.30 = 778,866.90/x
  3. Step 3: Cross multiply
    778,866.90x = 1,091,988.30 × 778,866.90
  4. Step 4: Simplify right side
    778,866.90x = 850,513,542,057.27
  5. Step 5: Solve for x
    x = 850,513,542,057.27/778,866.90
  6. Step 6: Final answer
    x = 1,091,988.30

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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.