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Finding the Fourth Proportional to 15,991.47, 22,067.55 and 8,918.55

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Solution

The fourth proportional to 15,991.47, 22,067.55 and 8,918.55 is: 12,307.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,991.47 : 22,067.55 = 8,918.55 : x
  2. Step 2: Convert to fraction form
    15,991.47/22,067.55 = 8,918.55/x
  3. Step 3: Cross multiply
    15,991.47x = 22,067.55 × 8,918.55
  4. Step 4: Simplify right side
    15,991.47x = 196,810,548.05
  5. Step 5: Solve for x
    x = 196,810,548.05/15,991.47
  6. Step 6: Final answer
    x = 12,307.22

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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.