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Finding the Fourth Proportional to 13,902.70, 19,188.69 and 8,865.70

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Solution

The fourth proportional to 13,902.70, 19,188.69 and 8,865.70 is: 12,236.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,902.70 : 19,188.69 = 8,865.70 : x
  2. Step 2: Convert to fraction form
    13,902.70/19,188.69 = 8,865.70/x
  3. Step 3: Cross multiply
    13,902.70x = 19,188.69 × 8,865.70
  4. Step 4: Simplify right side
    13,902.70x = 170,121,168.93
  5. Step 5: Solve for x
    x = 170,121,168.93/13,902.70
  6. Step 6: Final answer
    x = 12,236.56

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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.