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Finding the Third Proportional to 389.75 and 579.88

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Solution

The third proportional to 389.75 and 579.88 is: 862.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.75 : 579.88 = 579.88 : x
  2. Step 2: Convert to fraction form
    389.75/579.88 = 579.88/x
  3. Step 3: Cross multiply
    389.75x = 579.88 × 579.88
  4. Step 4: Simplify right side
    389.75x = 336,255.02
  5. Step 5: Solve for x
    x = 336,255.02/389.75
  6. Step 6: Final answer
    x = 862.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.