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Finding the Fourth Proportional to 72,571.89, 100,131.66 and 42,339.96

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Solution

The fourth proportional to 72,571.89, 100,131.66 and 42,339.96 is: 58,418.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,571.89 : 100,131.66 = 42,339.96 : x
  2. Step 2: Convert to fraction form
    72,571.89/100,131.66 = 42,339.96/x
  3. Step 3: Cross multiply
    72,571.89x = 100,131.66 × 42,339.96
  4. Step 4: Simplify right side
    72,571.89x = 4,239,570,479.13
  5. Step 5: Solve for x
    x = 4,239,570,479.13/72,571.89
  6. Step 6: Final answer
    x = 58,418.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.