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Finding the Fourth Proportional to 664.52, 987.81 and 644.83

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Solution

The fourth proportional to 664.52, 987.81 and 644.83 is: 958.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.52 : 987.81 = 644.83 : x
  2. Step 2: Convert to fraction form
    664.52/987.81 = 644.83/x
  3. Step 3: Cross multiply
    664.52x = 987.81 × 644.83
  4. Step 4: Simplify right side
    664.52x = 636,964.63
  5. Step 5: Solve for x
    x = 636,964.63/664.52
  6. Step 6: Final answer
    x = 958.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.