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Finding the Fourth Proportional to 15,629.21, 21,568.91 and 8,915.93

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Solution

The fourth proportional to 15,629.21, 21,568.91 and 8,915.93 is: 12,304.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,629.21 : 21,568.91 = 8,915.93 : x
  2. Step 2: Convert to fraction form
    15,629.21/21,568.91 = 8,915.93/x
  3. Step 3: Cross multiply
    15,629.21x = 21,568.91 × 8,915.93
  4. Step 4: Simplify right side
    15,629.21x = 192,306,891.74
  5. Step 5: Solve for x
    x = 192,306,891.74/15,629.21
  6. Step 6: Final answer
    x = 12,304.33

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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.