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Finding the Fourth Proportional to 15,145.53, 20,900.80 and 8,431.74

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Solution

The fourth proportional to 15,145.53, 20,900.80 and 8,431.74 is: 11,635.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.53 : 20,900.80 = 8,431.74 : x
  2. Step 2: Convert to fraction form
    15,145.53/20,900.80 = 8,431.74/x
  3. Step 3: Cross multiply
    15,145.53x = 20,900.80 × 8,431.74
  4. Step 4: Simplify right side
    15,145.53x = 176,230,111.39
  5. Step 5: Solve for x
    x = 176,230,111.39/15,145.53
  6. Step 6: Final answer
    x = 11,635.78

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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.