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Finding the Third Proportional to 987.75 and 1,355

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Solution

The third proportional to 987.75 and 1,355 is: 1,858.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.75 : 1,355 = 1,355 : x
  2. Step 2: Convert to fraction form
    987.75/1,355 = 1,355/x
  3. Step 3: Cross multiply
    987.75x = 1,355 × 1,355
  4. Step 4: Simplify right side
    987.75x = 1,836,025
  5. Step 5: Solve for x
    x = 1,836,025/987.75
  6. Step 6: Final answer
    x = 1,858.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.