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Finding the Fourth Proportional to 15,145.96, 20,900.80 and 8,431.39

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Solution

The fourth proportional to 15,145.96, 20,900.80 and 8,431.39 is: 11,634.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.96 : 20,900.80 = 8,431.39 : x
  2. Step 2: Convert to fraction form
    15,145.96/20,900.80 = 8,431.39/x
  3. Step 3: Cross multiply
    15,145.96x = 20,900.80 × 8,431.39
  4. Step 4: Simplify right side
    15,145.96x = 176,222,796.11
  5. Step 5: Solve for x
    x = 176,222,796.11/15,145.96
  6. Step 6: Final answer
    x = 11,634.97

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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.