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Finding the Fourth Proportional to 18,709.76, 25,808.64 and 12,085.76

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Solution

The fourth proportional to 18,709.76, 25,808.64 and 12,085.76 is: 16,671.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.76 : 25,808.64 = 12,085.76 : x
  2. Step 2: Convert to fraction form
    18,709.76/25,808.64 = 12,085.76/x
  3. Step 3: Cross multiply
    18,709.76x = 25,808.64 × 12,085.76
  4. Step 4: Simplify right side
    18,709.76x = 311,917,028.97
  5. Step 5: Solve for x
    x = 311,917,028.97/18,709.76
  6. Step 6: Final answer
    x = 16,671.35

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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.