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Finding the Fourth Proportional to 15,143.20, 20,885.77 and 9,839.72

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Solution

The fourth proportional to 15,143.20, 20,885.77 and 9,839.72 is: 13,571.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.20 : 20,885.77 = 9,839.72 : x
  2. Step 2: Convert to fraction form
    15,143.20/20,885.77 = 9,839.72/x
  3. Step 3: Cross multiply
    15,143.20x = 20,885.77 × 9,839.72
  4. Step 4: Simplify right side
    15,143.20x = 205,510,128.78
  5. Step 5: Solve for x
    x = 205,510,128.78/15,143.20
  6. Step 6: Final answer
    x = 13,571.12

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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.