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Finding the Fourth Proportional to 291.87, 438.03 and 109.38

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Solution

The fourth proportional to 291.87, 438.03 and 109.38 is: 164.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.87 : 438.03 = 109.38 : x
  2. Step 2: Convert to fraction form
    291.87/438.03 = 109.38/x
  3. Step 3: Cross multiply
    291.87x = 438.03 × 109.38
  4. Step 4: Simplify right side
    291.87x = 47,911.72
  5. Step 5: Solve for x
    x = 47,911.72/291.87
  6. Step 6: Final answer
    x = 164.15

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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.