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Finding the Fourth Proportional to 1,387,788.90, 1,915,221.78 and 843,834.60

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Solution

The fourth proportional to 1,387,788.90, 1,915,221.78 and 843,834.60 is: 1,164,536.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,788.90 : 1,915,221.78 = 843,834.60 : x
  2. Step 2: Convert to fraction form
    1,387,788.90/1,915,221.78 = 843,834.60/x
  3. Step 3: Cross multiply
    1,387,788.90x = 1,915,221.78 × 843,834.60
  4. Step 4: Simplify right side
    1,387,788.90x = 1,616,130,404,637.59
  5. Step 5: Solve for x
    x = 1,616,130,404,637.59/1,387,788.90
  6. Step 6: Final answer
    x = 1,164,536.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.