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Finding the Fourth Proportional to 121,163.40, 167,213.40 and 73,421.28

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Solution

The fourth proportional to 121,163.40, 167,213.40 and 73,421.28 is: 101,326.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,163.40 : 167,213.40 = 73,421.28 : x
  2. Step 2: Convert to fraction form
    121,163.40/167,213.40 = 73,421.28/x
  3. Step 3: Cross multiply
    121,163.40x = 167,213.40 × 73,421.28
  4. Step 4: Simplify right side
    121,163.40x = 12,277,021,861.15
  5. Step 5: Solve for x
    x = 12,277,021,861.15/121,163.40
  6. Step 6: Final answer
    x = 101,326.16

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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.