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Finding the Third Proportional to 189.75 and 310.38

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Solution

The third proportional to 189.75 and 310.38 is: 507.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 310.38 = 310.38 : x
  2. Step 2: Convert to fraction form
    189.75/310.38 = 310.38/x
  3. Step 3: Cross multiply
    189.75x = 310.38 × 310.38
  4. Step 4: Simplify right side
    189.75x = 96,332.64
  5. Step 5: Solve for x
    x = 96,332.64/189.75
  6. Step 6: Final answer
    x = 507.68

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.