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Finding the Fourth Proportional to 103,964.20, 156,019.20 and 66,615.10

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Solution

The fourth proportional to 103,964.20, 156,019.20 and 66,615.10 is: 99,969.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,964.20 : 156,019.20 = 66,615.10 : x
  2. Step 2: Convert to fraction form
    103,964.20/156,019.20 = 66,615.10/x
  3. Step 3: Cross multiply
    103,964.20x = 156,019.20 × 66,615.10
  4. Step 4: Simplify right side
    103,964.20x = 10,393,234,609.92
  5. Step 5: Solve for x
    x = 10,393,234,609.92/103,964.20
  6. Step 6: Final answer
    x = 99,969.36

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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.