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Finding the Third Proportional to 644.63 and 988.88

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Solution

The third proportional to 644.63 and 988.88 is: 1,516.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.63 : 988.88 = 988.88 : x
  2. Step 2: Convert to fraction form
    644.63/988.88 = 988.88/x
  3. Step 3: Cross multiply
    644.63x = 988.88 × 988.88
  4. Step 4: Simplify right side
    644.63x = 977,873.77
  5. Step 5: Solve for x
    x = 977,873.77/644.63
  6. Step 6: Final answer
    x = 1,516.97

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.