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Finding the Fourth Proportional to 66,902.58, 100,354.59 and 20,155.86

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Solution

The fourth proportional to 66,902.58, 100,354.59 and 20,155.86 is: 30,234.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,902.58 : 100,354.59 = 20,155.86 : x
  2. Step 2: Convert to fraction form
    66,902.58/100,354.59 = 20,155.86/x
  3. Step 3: Cross multiply
    66,902.58x = 100,354.59 × 20,155.86
  4. Step 4: Simplify right side
    66,902.58x = 2,022,733,066.40
  5. Step 5: Solve for x
    x = 2,022,733,066.40/66,902.58
  6. Step 6: Final answer
    x = 30,234.01

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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.