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Finding the Third Proportional to 661.50 and 987.19

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Solution

The third proportional to 661.50 and 987.19 is: 1,473.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 987.19 = 987.19 : x
  2. Step 2: Convert to fraction form
    661.50/987.19 = 987.19/x
  3. Step 3: Cross multiply
    661.50x = 987.19 × 987.19
  4. Step 4: Simplify right side
    661.50x = 974,539.16
  5. Step 5: Solve for x
    x = 974,539.16/661.50
  6. Step 6: Final answer
    x = 1,473.23

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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.