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Finding the Fourth Proportional to 429.91, 644.86 and 238.75

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Solution

The fourth proportional to 429.91, 644.86 and 238.75 is: 358.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.91 : 644.86 = 238.75 : x
  2. Step 2: Convert to fraction form
    429.91/644.86 = 238.75/x
  3. Step 3: Cross multiply
    429.91x = 644.86 × 238.75
  4. Step 4: Simplify right side
    429.91x = 153,959.01
  5. Step 5: Solve for x
    x = 153,959.01/429.91
  6. Step 6: Final answer
    x = 358.12

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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.