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Finding the Fourth Proportional to 111.15, 165.90 and 103

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Solution

The fourth proportional to 111.15, 165.90 and 103 is: 153.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.15 : 165.90 = 103 : x
  2. Step 2: Convert to fraction form
    111.15/165.90 = 103/x
  3. Step 3: Cross multiply
    111.15x = 165.90 × 103
  4. Step 4: Simplify right side
    111.15x = 17,087.70
  5. Step 5: Solve for x
    x = 17,087.70/111.15
  6. Step 6: Final answer
    x = 153.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.