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Finding the Fourth Proportional to 13,912.88, 20,875.20 and 7,343.84

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Solution

The fourth proportional to 13,912.88, 20,875.20 and 7,343.84 is: 11,018.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,912.88 : 20,875.20 = 7,343.84 : x
  2. Step 2: Convert to fraction form
    13,912.88/20,875.20 = 7,343.84/x
  3. Step 3: Cross multiply
    13,912.88x = 20,875.20 × 7,343.84
  4. Step 4: Simplify right side
    13,912.88x = 153,304,128.77
  5. Step 5: Solve for x
    x = 153,304,128.77/13,912.88
  6. Step 6: Final answer
    x = 11,018.86

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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.