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Finding the Third Proportional to 515.50 and 756.50

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Solution

The third proportional to 515.50 and 756.50 is: 1,110.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.50 : 756.50 = 756.50 : x
  2. Step 2: Convert to fraction form
    515.50/756.50 = 756.50/x
  3. Step 3: Cross multiply
    515.50x = 756.50 × 756.50
  4. Step 4: Simplify right side
    515.50x = 572,292.25
  5. Step 5: Solve for x
    x = 572,292.25/515.50
  6. Step 6: Final answer
    x = 1,110.17

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.