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Finding the Fourth Proportional to 111,916.80, 167,721.60 and 91,180.80

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Solution

The fourth proportional to 111,916.80, 167,721.60 and 91,180.80 is: 136,646.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,916.80 : 167,721.60 = 91,180.80 : x
  2. Step 2: Convert to fraction form
    111,916.80/167,721.60 = 91,180.80/x
  3. Step 3: Cross multiply
    111,916.80x = 167,721.60 × 91,180.80
  4. Step 4: Simplify right side
    111,916.80x = 15,292,989,665.28
  5. Step 5: Solve for x
    x = 15,292,989,665.28/111,916.80
  6. Step 6: Final answer
    x = 136,646.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.