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Finding the Fourth Proportional to 662.26, 988.39 and 644.98

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Solution

The fourth proportional to 662.26, 988.39 and 644.98 is: 962.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.26 : 988.39 = 644.98 : x
  2. Step 2: Convert to fraction form
    662.26/988.39 = 644.98/x
  3. Step 3: Cross multiply
    662.26x = 988.39 × 644.98
  4. Step 4: Simplify right side
    662.26x = 637,488.56
  5. Step 5: Solve for x
    x = 637,488.56/662.26
  6. Step 6: Final answer
    x = 962.60

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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.