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Finding the Fourth Proportional to 289.15, 433.40 and 115.77

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Solution

The fourth proportional to 289.15, 433.40 and 115.77 is: 173.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.15 : 433.40 = 115.77 : x
  2. Step 2: Convert to fraction form
    289.15/433.40 = 115.77/x
  3. Step 3: Cross multiply
    289.15x = 433.40 × 115.77
  4. Step 4: Simplify right side
    289.15x = 50,174.72
  5. Step 5: Solve for x
    x = 50,174.72/289.15
  6. Step 6: Final answer
    x = 173.52

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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.