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Finding the Fourth Proportional to 15,865.18, 21,891.45 and 8,791.36

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Solution

The fourth proportional to 15,865.18, 21,891.45 and 8,791.36 is: 12,130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.18 : 21,891.45 = 8,791.36 : x
  2. Step 2: Convert to fraction form
    15,865.18/21,891.45 = 8,791.36/x
  3. Step 3: Cross multiply
    15,865.18x = 21,891.45 × 8,791.36
  4. Step 4: Simplify right side
    15,865.18x = 192,455,617.87
  5. Step 5: Solve for x
    x = 192,455,617.87/15,865.18
  6. Step 6: Final answer
    x = 12,130.69

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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.