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Finding the Fourth Proportional to 861,640.84, 1,291,320.78 and 661,195

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Solution

The fourth proportional to 861,640.84, 1,291,320.78 and 661,195 is: 990,917.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,640.84 : 1,291,320.78 = 661,195 : x
  2. Step 2: Convert to fraction form
    861,640.84/1,291,320.78 = 661,195/x
  3. Step 3: Cross multiply
    861,640.84x = 1,291,320.78 × 661,195
  4. Step 4: Simplify right side
    861,640.84x = 853,814,843,132.10
  5. Step 5: Solve for x
    x = 853,814,843,132.10/861,640.84
  6. Step 6: Final answer
    x = 990,917.33

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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.