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Finding the Fourth Proportional to 66,638.58, 91,961.33 and 38,343.70

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Solution

The fourth proportional to 66,638.58, 91,961.33 and 38,343.70 is: 52,914.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,638.58 : 91,961.33 = 38,343.70 : x
  2. Step 2: Convert to fraction form
    66,638.58/91,961.33 = 38,343.70/x
  3. Step 3: Cross multiply
    66,638.58x = 91,961.33 × 38,343.70
  4. Step 4: Simplify right side
    66,638.58x = 3,526,137,649.12
  5. Step 5: Solve for x
    x = 3,526,137,649.12/66,638.58
  6. Step 6: Final answer
    x = 52,914.36

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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.