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Finding the Fourth Proportional to 111,989.53, 168,038.16 and 69,858.80

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Solution

The fourth proportional to 111,989.53, 168,038.16 and 69,858.80 is: 104,821.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,989.53 : 168,038.16 = 69,858.80 : x
  2. Step 2: Convert to fraction form
    111,989.53/168,038.16 = 69,858.80/x
  3. Step 3: Cross multiply
    111,989.53x = 168,038.16 × 69,858.80
  4. Step 4: Simplify right side
    111,989.53x = 11,738,943,371.62
  5. Step 5: Solve for x
    x = 11,738,943,371.62/111,989.53
  6. Step 6: Final answer
    x = 104,821.80

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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.