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Finding the Third Proportional to 189.63 and 287.13

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Solution

The third proportional to 189.63 and 287.13 is: 434.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.63 : 287.13 = 287.13 : x
  2. Step 2: Convert to fraction form
    189.63/287.13 = 287.13/x
  3. Step 3: Cross multiply
    189.63x = 287.13 × 287.13
  4. Step 4: Simplify right side
    189.63x = 82,440.77
  5. Step 5: Solve for x
    x = 82,440.77/189.63
  6. Step 6: Final answer
    x = 434.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.