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Finding the Fourth Proportional to 111,287.80, 166,704.90 and 69,038.20

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Solution

The fourth proportional to 111,287.80, 166,704.90 and 69,038.20 is: 103,416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,287.80 : 166,704.90 = 69,038.20 : x
  2. Step 2: Convert to fraction form
    111,287.80/166,704.90 = 69,038.20/x
  3. Step 3: Cross multiply
    111,287.80x = 166,704.90 × 69,038.20
  4. Step 4: Simplify right side
    111,287.80x = 11,509,006,227.18
  5. Step 5: Solve for x
    x = 11,509,006,227.18/111,287.80
  6. Step 6: Final answer
    x = 103,416.60

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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.