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Finding the Fourth Proportional to 13,919.74, 20,886.30 and 6,900.40

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Solution

The fourth proportional to 13,919.74, 20,886.30 and 6,900.40 is: 10,353.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.74 : 20,886.30 = 6,900.40 : x
  2. Step 2: Convert to fraction form
    13,919.74/20,886.30 = 6,900.40/x
  3. Step 3: Cross multiply
    13,919.74x = 20,886.30 × 6,900.40
  4. Step 4: Simplify right side
    13,919.74x = 144,123,824.52
  5. Step 5: Solve for x
    x = 144,123,824.52/13,919.74
  6. Step 6: Final answer
    x = 10,353.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.