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Finding the Third Proportional to 647.50 and 831.75

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Solution

The third proportional to 647.50 and 831.75 is: 1,068.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.50 : 831.75 = 831.75 : x
  2. Step 2: Convert to fraction form
    647.50/831.75 = 831.75/x
  3. Step 3: Cross multiply
    647.50x = 831.75 × 831.75
  4. Step 4: Simplify right side
    647.50x = 691,808.06
  5. Step 5: Solve for x
    x = 691,808.06/647.50
  6. Step 6: Final answer
    x = 1,068.43

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.