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Finding the Fourth Proportional to 644.81, 964.89 and 558.44

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Solution

The fourth proportional to 644.81, 964.89 and 558.44 is: 835.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 964.89 = 558.44 : x
  2. Step 2: Convert to fraction form
    644.81/964.89 = 558.44/x
  3. Step 3: Cross multiply
    644.81x = 964.89 × 558.44
  4. Step 4: Simplify right side
    644.81x = 538,833.17
  5. Step 5: Solve for x
    x = 538,833.17/644.81
  6. Step 6: Final answer
    x = 835.65

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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.