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Finding the Fourth Proportional to 15,021.75, 20,729.92 and 8,307.25

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Solution

The fourth proportional to 15,021.75, 20,729.92 and 8,307.25 is: 11,463.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,021.75 : 20,729.92 = 8,307.25 : x
  2. Step 2: Convert to fraction form
    15,021.75/20,729.92 = 8,307.25/x
  3. Step 3: Cross multiply
    15,021.75x = 20,729.92 × 8,307.25
  4. Step 4: Simplify right side
    15,021.75x = 172,208,627.92
  5. Step 5: Solve for x
    x = 172,208,627.92/15,021.75
  6. Step 6: Final answer
    x = 11,463.95

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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.