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Finding the Fourth Proportional to 15,143.28, 20,918.01 and 11,650.15

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Solution

The fourth proportional to 15,143.28, 20,918.01 and 11,650.15 is: 16,092.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.28 : 20,918.01 = 11,650.15 : x
  2. Step 2: Convert to fraction form
    15,143.28/20,918.01 = 11,650.15/x
  3. Step 3: Cross multiply
    15,143.28x = 20,918.01 × 11,650.15
  4. Step 4: Simplify right side
    15,143.28x = 243,697,954.20
  5. Step 5: Solve for x
    x = 243,697,954.20/15,143.28
  6. Step 6: Final answer
    x = 16,092.81

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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.