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Finding the Fourth Proportional to 291.91, 438.07 and 109.45

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Solution

The fourth proportional to 291.91, 438.07 and 109.45 is: 164.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.91 : 438.07 = 109.45 : x
  2. Step 2: Convert to fraction form
    291.91/438.07 = 109.45/x
  3. Step 3: Cross multiply
    291.91x = 438.07 × 109.45
  4. Step 4: Simplify right side
    291.91x = 47,946.76
  5. Step 5: Solve for x
    x = 47,946.76/291.91
  6. Step 6: Final answer
    x = 164.25

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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.