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Finding the Fourth Proportional to 664.34, 988.66 and 644.90

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Solution

The fourth proportional to 664.34, 988.66 and 644.90 is: 959.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.34 : 988.66 = 644.90 : x
  2. Step 2: Convert to fraction form
    664.34/988.66 = 644.90/x
  3. Step 3: Cross multiply
    664.34x = 988.66 × 644.90
  4. Step 4: Simplify right side
    664.34x = 637,586.83
  5. Step 5: Solve for x
    x = 637,586.83/664.34
  6. Step 6: Final answer
    x = 959.73

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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.