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Finding the Fourth Proportional to 66,638.88, 99,958.32 and 19,890.24

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Solution

The fourth proportional to 66,638.88, 99,958.32 and 19,890.24 is: 29,835.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,638.88 : 99,958.32 = 19,890.24 : x
  2. Step 2: Convert to fraction form
    66,638.88/99,958.32 = 19,890.24/x
  3. Step 3: Cross multiply
    66,638.88x = 99,958.32 × 19,890.24
  4. Step 4: Simplify right side
    66,638.88x = 1,988,194,974.80
  5. Step 5: Solve for x
    x = 1,988,194,974.80/66,638.88
  6. Step 6: Final answer
    x = 29,835.36

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Similar ratio
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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.