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Finding the Fourth Proportional to 15,791.49, 21,792.75 and 9,078.48

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Solution

The fourth proportional to 15,791.49, 21,792.75 and 9,078.48 is: 12,528.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.49 : 21,792.75 = 9,078.48 : x
  2. Step 2: Convert to fraction form
    15,791.49/21,792.75 = 9,078.48/x
  3. Step 3: Cross multiply
    15,791.49x = 21,792.75 × 9,078.48
  4. Step 4: Simplify right side
    15,791.49x = 197,845,010.98
  5. Step 5: Solve for x
    x = 197,845,010.98/15,791.49
  6. Step 6: Final answer
    x = 12,528.58

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1.5x scale

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.