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Finding the Fourth Proportional to 13,915.68, 20,881.89 and 7,679.76

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Solution

The fourth proportional to 13,915.68, 20,881.89 and 7,679.76 is: 11,524.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.68 : 20,881.89 = 7,679.76 : x
  2. Step 2: Convert to fraction form
    13,915.68/20,881.89 = 7,679.76/x
  3. Step 3: Cross multiply
    13,915.68x = 20,881.89 × 7,679.76
  4. Step 4: Simplify right side
    13,915.68x = 160,367,903.55
  5. Step 5: Solve for x
    x = 160,367,903.55/13,915.68
  6. Step 6: Final answer
    x = 11,524.26

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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.