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Finding the Fourth Proportional to 15,139.86, 20,895.51 and 8,851.02

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Solution

The fourth proportional to 15,139.86, 20,895.51 and 8,851.02 is: 12,215.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.86 : 20,895.51 = 8,851.02 : x
  2. Step 2: Convert to fraction form
    15,139.86/20,895.51 = 8,851.02/x
  3. Step 3: Cross multiply
    15,139.86x = 20,895.51 × 8,851.02
  4. Step 4: Simplify right side
    15,139.86x = 184,946,576.92
  5. Step 5: Solve for x
    x = 184,946,576.92/15,139.86
  6. Step 6: Final answer
    x = 12,215.87

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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.