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Finding the Fourth Proportional to 778,869.15, 1,091,991.45 and 778,869.15

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Solution

The fourth proportional to 778,869.15, 1,091,991.45 and 778,869.15 is: 1,091,991.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,869.15 : 1,091,991.45 = 778,869.15 : x
  2. Step 2: Convert to fraction form
    778,869.15/1,091,991.45 = 778,869.15/x
  3. Step 3: Cross multiply
    778,869.15x = 1,091,991.45 × 778,869.15
  4. Step 4: Simplify right side
    778,869.15x = 850,518,452,468.77
  5. Step 5: Solve for x
    x = 850,518,452,468.77/778,869.15
  6. Step 6: Final answer
    x = 1,091,991.45

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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.