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Finding the Fourth Proportional to 18,903.92, 26,078.64 and 12,191.70

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Solution

The fourth proportional to 18,903.92, 26,078.64 and 12,191.70 is: 16,818.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,903.92 : 26,078.64 = 12,191.70 : x
  2. Step 2: Convert to fraction form
    18,903.92/26,078.64 = 12,191.70/x
  3. Step 3: Cross multiply
    18,903.92x = 26,078.64 × 12,191.70
  4. Step 4: Simplify right side
    18,903.92x = 317,942,955.29
  5. Step 5: Solve for x
    x = 317,942,955.29/18,903.92
  6. Step 6: Final answer
    x = 16,818.89

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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.