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Finding the Fourth Proportional to 20,486.64, 30,729.96 and 6,636.72

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Solution

The fourth proportional to 20,486.64, 30,729.96 and 6,636.72 is: 9,955.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.64 : 30,729.96 = 6,636.72 : x
  2. Step 2: Convert to fraction form
    20,486.64/30,729.96 = 6,636.72/x
  3. Step 3: Cross multiply
    20,486.64x = 30,729.96 × 6,636.72
  4. Step 4: Simplify right side
    20,486.64x = 203,946,140.13
  5. Step 5: Solve for x
    x = 203,946,140.13/20,486.64
  6. Step 6: Final answer
    x = 9,955.08

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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.