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Finding the Third Proportional to 139.50 and 310.13

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Solution

The third proportional to 139.50 and 310.13 is: 689.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.50 : 310.13 = 310.13 : x
  2. Step 2: Convert to fraction form
    139.50/310.13 = 310.13/x
  3. Step 3: Cross multiply
    139.50x = 310.13 × 310.13
  4. Step 4: Simplify right side
    139.50x = 96,177.52
  5. Step 5: Solve for x
    x = 96,177.52/139.50
  6. Step 6: Final answer
    x = 689.44

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.