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Finding the Fourth Proportional to 893.71, 1,339.34 and 644.94

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Solution

The fourth proportional to 893.71, 1,339.34 and 644.94 is: 966.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.71 : 1,339.34 = 644.94 : x
  2. Step 2: Convert to fraction form
    893.71/1,339.34 = 644.94/x
  3. Step 3: Cross multiply
    893.71x = 1,339.34 × 644.94
  4. Step 4: Simplify right side
    893.71x = 863,786.84
  5. Step 5: Solve for x
    x = 863,786.84/893.71
  6. Step 6: Final answer
    x = 966.51

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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.