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Finding the Fourth Proportional to 111,288.80, 166,706.40 and 69,039.20

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Solution

The fourth proportional to 111,288.80, 166,706.40 and 69,039.20 is: 103,418.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,288.80 : 166,706.40 = 69,039.20 : x
  2. Step 2: Convert to fraction form
    111,288.80/166,706.40 = 69,039.20/x
  3. Step 3: Cross multiply
    111,288.80x = 166,706.40 × 69,039.20
  4. Step 4: Simplify right side
    111,288.80x = 11,509,276,490.88
  5. Step 5: Solve for x
    x = 11,509,276,490.88/111,288.80
  6. Step 6: Final answer
    x = 103,418.10

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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.