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Finding the Third Proportional to 390.75 and 571.75

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Solution

The third proportional to 390.75 and 571.75 is: 836.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.75 : 571.75 = 571.75 : x
  2. Step 2: Convert to fraction form
    390.75/571.75 = 571.75/x
  3. Step 3: Cross multiply
    390.75x = 571.75 × 571.75
  4. Step 4: Simplify right side
    390.75x = 326,898.06
  5. Step 5: Solve for x
    x = 326,898.06/390.75
  6. Step 6: Final answer
    x = 836.59

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.