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Finding the Fourth Proportional to 121,650.64, 167,870.91 and 72,647.56

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Solution

The fourth proportional to 121,650.64, 167,870.91 and 72,647.56 is: 100,249.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,650.64 : 167,870.91 = 72,647.56 : x
  2. Step 2: Convert to fraction form
    121,650.64/167,870.91 = 72,647.56/x
  3. Step 3: Cross multiply
    121,650.64x = 167,870.91 × 72,647.56
  4. Step 4: Simplify right side
    121,650.64x = 12,195,412,006.48
  5. Step 5: Solve for x
    x = 12,195,412,006.48/121,650.64
  6. Step 6: Final answer
    x = 100,249.47

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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.