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Finding the Fourth Proportional to 429.71, 644.91 and 155.99

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Solution

The fourth proportional to 429.71, 644.91 and 155.99 is: 234.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.71 : 644.91 = 155.99 : x
  2. Step 2: Convert to fraction form
    429.71/644.91 = 155.99/x
  3. Step 3: Cross multiply
    429.71x = 644.91 × 155.99
  4. Step 4: Simplify right side
    429.71x = 100,601.12
  5. Step 5: Solve for x
    x = 100,601.12/429.71
  6. Step 6: Final answer
    x = 234.11

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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.