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Finding the Fourth Proportional to 15,791.94, 21,792.87 and 8,718.41

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Solution

The fourth proportional to 15,791.94, 21,792.87 and 8,718.41 is: 12,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.94 : 21,792.87 = 8,718.41 : x
  2. Step 2: Convert to fraction form
    15,791.94/21,792.87 = 8,718.41/x
  3. Step 3: Cross multiply
    15,791.94x = 21,792.87 × 8,718.41
  4. Step 4: Simplify right side
    15,791.94x = 189,999,175.74
  5. Step 5: Solve for x
    x = 189,999,175.74/15,791.94
  6. Step 6: Final answer
    x = 12,031.40

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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.