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Finding the Third Proportional to 390.94 and 615.38

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Solution

The third proportional to 390.94 and 615.38 is: 968.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.94 : 615.38 = 615.38 : x
  2. Step 2: Convert to fraction form
    390.94/615.38 = 615.38/x
  3. Step 3: Cross multiply
    390.94x = 615.38 × 615.38
  4. Step 4: Simplify right side
    390.94x = 378,686.39
  5. Step 5: Solve for x
    x = 378,686.39/390.94
  6. Step 6: Final answer
    x = 968.66

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.