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Finding the Third Proportional to 978.75 and 2,138.75

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Solution

The third proportional to 978.75 and 2,138.75 is: 4,673.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.75 : 2,138.75 = 2,138.75 : x
  2. Step 2: Convert to fraction form
    978.75/2,138.75 = 2,138.75/x
  3. Step 3: Cross multiply
    978.75x = 2,138.75 × 2,138.75
  4. Step 4: Simplify right side
    978.75x = 4,574,251.56
  5. Step 5: Solve for x
    x = 4,574,251.56/978.75
  6. Step 6: Final answer
    x = 4,673.56

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.