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Finding the Fourth Proportional to 72,684.70, 109,027.05 and 39,420.70

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Solution

The fourth proportional to 72,684.70, 109,027.05 and 39,420.70 is: 59,131.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,684.70 : 109,027.05 = 39,420.70 : x
  2. Step 2: Convert to fraction form
    72,684.70/109,027.05 = 39,420.70/x
  3. Step 3: Cross multiply
    72,684.70x = 109,027.05 × 39,420.70
  4. Step 4: Simplify right side
    72,684.70x = 4,297,922,629.94
  5. Step 5: Solve for x
    x = 4,297,922,629.94/72,684.70
  6. Step 6: Final answer
    x = 59,131.05

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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.