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Finding the Third Proportional to 389.63 and 557.63

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Solution

The third proportional to 389.63 and 557.63 is: 798.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.63 : 557.63 = 557.63 : x
  2. Step 2: Convert to fraction form
    389.63/557.63 = 557.63/x
  3. Step 3: Cross multiply
    389.63x = 557.63 × 557.63
  4. Step 4: Simplify right side
    389.63x = 310,945.64
  5. Step 5: Solve for x
    x = 310,945.64/389.63
  6. Step 6: Final answer
    x = 798.06

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.