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Finding the Third Proportional to 646.50 and 991.63

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Solution

The third proportional to 646.50 and 991.63 is: 1,520.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.50 : 991.63 = 991.63 : x
  2. Step 2: Convert to fraction form
    646.50/991.63 = 991.63/x
  3. Step 3: Cross multiply
    646.50x = 991.63 × 991.63
  4. Step 4: Simplify right side
    646.50x = 983,320.14
  5. Step 5: Solve for x
    x = 983,320.14/646.50
  6. Step 6: Final answer
    x = 1,520.99

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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.