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Finding the Fourth Proportional to 15,864.85, 21,893.64 and 8,791.42

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Solution

The fourth proportional to 15,864.85, 21,893.64 and 8,791.42 is: 12,132.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,864.85 : 21,893.64 = 8,791.42 : x
  2. Step 2: Convert to fraction form
    15,864.85/21,893.64 = 8,791.42/x
  3. Step 3: Cross multiply
    15,864.85x = 21,893.64 × 8,791.42
  4. Step 4: Simplify right side
    15,864.85x = 192,476,184.57
  5. Step 5: Solve for x
    x = 192,476,184.57/15,864.85
  6. Step 6: Final answer
    x = 12,132.24

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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.