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Finding the Third Proportional to 978.50 and 1,315.75

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Solution

The third proportional to 978.50 and 1,315.75 is: 1,769.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.50 : 1,315.75 = 1,315.75 : x
  2. Step 2: Convert to fraction form
    978.50/1,315.75 = 1,315.75/x
  3. Step 3: Cross multiply
    978.50x = 1,315.75 × 1,315.75
  4. Step 4: Simplify right side
    978.50x = 1,731,198.06
  5. Step 5: Solve for x
    x = 1,731,198.06/978.50
  6. Step 6: Final answer
    x = 1,769.24

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.