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Finding the Fourth Proportional to 121,379.76, 167,509.20 and 67,664.72

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Solution

The fourth proportional to 121,379.76, 167,509.20 and 67,664.72 is: 93,380.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,379.76 : 167,509.20 = 67,664.72 : x
  2. Step 2: Convert to fraction form
    121,379.76/167,509.20 = 67,664.72/x
  3. Step 3: Cross multiply
    121,379.76x = 167,509.20 × 67,664.72
  4. Step 4: Simplify right side
    121,379.76x = 11,334,463,115.42
  5. Step 5: Solve for x
    x = 11,334,463,115.42/121,379.76
  6. Step 6: Final answer
    x = 93,380.17

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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.