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Finding the Fourth Proportional to 66,745.68, 100,129.59 and 31,666.20

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Solution

The fourth proportional to 66,745.68, 100,129.59 and 31,666.20 is: 47,504.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,745.68 : 100,129.59 = 31,666.20 : x
  2. Step 2: Convert to fraction form
    66,745.68/100,129.59 = 31,666.20/x
  3. Step 3: Cross multiply
    66,745.68x = 100,129.59 × 31,666.20
  4. Step 4: Simplify right side
    66,745.68x = 3,170,723,622.86
  5. Step 5: Solve for x
    x = 3,170,723,622.86/66,745.68
  6. Step 6: Final answer
    x = 47,504.55

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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.