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Finding the Fourth Proportional to 13,761.16, 18,990.80 and 7,793.76

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Solution

The fourth proportional to 13,761.16, 18,990.80 and 7,793.76 is: 10,755.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,761.16 : 18,990.80 = 7,793.76 : x
  2. Step 2: Convert to fraction form
    13,761.16/18,990.80 = 7,793.76/x
  3. Step 3: Cross multiply
    13,761.16x = 18,990.80 × 7,793.76
  4. Step 4: Simplify right side
    13,761.16x = 148,009,737.41
  5. Step 5: Solve for x
    x = 148,009,737.41/13,761.16
  6. Step 6: Final answer
    x = 10,755.61

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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.