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Finding the Fourth Proportional to 111,005.40, 166,410.90 and 66,649.80

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Solution

The fourth proportional to 111,005.40, 166,410.90 and 66,649.80 is: 99,916.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,005.40 : 166,410.90 = 66,649.80 : x
  2. Step 2: Convert to fraction form
    111,005.40/166,410.90 = 66,649.80/x
  3. Step 3: Cross multiply
    111,005.40x = 166,410.90 × 66,649.80
  4. Step 4: Simplify right side
    111,005.40x = 11,091,253,202.82
  5. Step 5: Solve for x
    x = 11,091,253,202.82/111,005.40
  6. Step 6: Final answer
    x = 99,916.34

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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.