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Finding the Third Proportional to 187.13 and 389.63

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Solution

The third proportional to 187.13 and 389.63 is: 811.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.13 : 389.63 = 389.63 : x
  2. Step 2: Convert to fraction form
    187.13/389.63 = 389.63/x
  3. Step 3: Cross multiply
    187.13x = 389.63 × 389.63
  4. Step 4: Simplify right side
    187.13x = 151,807.64
  5. Step 5: Solve for x
    x = 151,807.64/187.13
  6. Step 6: Final answer
    x = 811.26

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.