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Finding the Fourth Proportional to 291.89, 438.01 and 109.28

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Solution

The fourth proportional to 291.89, 438.01 and 109.28 is: 163.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.89 : 438.01 = 109.28 : x
  2. Step 2: Convert to fraction form
    291.89/438.01 = 109.28/x
  3. Step 3: Cross multiply
    291.89x = 438.01 × 109.28
  4. Step 4: Simplify right side
    291.89x = 47,865.73
  5. Step 5: Solve for x
    x = 47,865.73/291.89
  6. Step 6: Final answer
    x = 163.99

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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.