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Finding the Fourth Proportional to 121,395.90, 167,466.80 and 81,119.56

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Solution

The fourth proportional to 121,395.90, 167,466.80 and 81,119.56 is: 111,905.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,395.90 : 167,466.80 = 81,119.56 : x
  2. Step 2: Convert to fraction form
    121,395.90/167,466.80 = 81,119.56/x
  3. Step 3: Cross multiply
    121,395.90x = 167,466.80 × 81,119.56
  4. Step 4: Simplify right side
    121,395.90x = 13,584,833,130.61
  5. Step 5: Solve for x
    x = 13,584,833,130.61/121,395.90
  6. Step 6: Final answer
    x = 111,905.21

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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.