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Finding the Third Proportional to 666.75 and 783.75

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Solution

The third proportional to 666.75 and 783.75 is: 921.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.75 : 783.75 = 783.75 : x
  2. Step 2: Convert to fraction form
    666.75/783.75 = 783.75/x
  3. Step 3: Cross multiply
    666.75x = 783.75 × 783.75
  4. Step 4: Simplify right side
    666.75x = 614,264.06
  5. Step 5: Solve for x
    x = 614,264.06/666.75
  6. Step 6: Final answer
    x = 921.28

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.