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Finding the Third Proportional to 386.57 and 719.75

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Solution

The third proportional to 386.57 and 719.75 is: 1,340.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.57 : 719.75 = 719.75 : x
  2. Step 2: Convert to fraction form
    386.57/719.75 = 719.75/x
  3. Step 3: Cross multiply
    386.57x = 719.75 × 719.75
  4. Step 4: Simplify right side
    386.57x = 518,033.03
  5. Step 5: Solve for x
    x = 518,033.03/386.57
  6. Step 6: Final answer
    x = 1,340.08

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.