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Finding the Fourth Proportional to 72,379.12, 108,531.64 and 30,247.69

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Solution

The fourth proportional to 72,379.12, 108,531.64 and 30,247.69 is: 45,356.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,379.12 : 108,531.64 = 30,247.69 : x
  2. Step 2: Convert to fraction form
    72,379.12/108,531.64 = 30,247.69/x
  3. Step 3: Cross multiply
    72,379.12x = 108,531.64 × 30,247.69
  4. Step 4: Simplify right side
    72,379.12x = 3,282,831,401.91
  5. Step 5: Solve for x
    x = 3,282,831,401.91/72,379.12
  6. Step 6: Final answer
    x = 45,356.06

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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.