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Finding the Fourth Proportional to 291.79, 439.04 and 231.58

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Solution

The fourth proportional to 291.79, 439.04 and 231.58 is: 348.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.79 : 439.04 = 231.58 : x
  2. Step 2: Convert to fraction form
    291.79/439.04 = 231.58/x
  3. Step 3: Cross multiply
    291.79x = 439.04 × 231.58
  4. Step 4: Simplify right side
    291.79x = 101,672.88
  5. Step 5: Solve for x
    x = 101,672.88/291.79
  6. Step 6: Final answer
    x = 348.45

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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.