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Finding the Third Proportional to 399.19 and 607.31

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Solution

The third proportional to 399.19 and 607.31 is: 923.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.19 : 607.31 = 607.31 : x
  2. Step 2: Convert to fraction form
    399.19/607.31 = 607.31/x
  3. Step 3: Cross multiply
    399.19x = 607.31 × 607.31
  4. Step 4: Simplify right side
    399.19x = 368,828.47
  5. Step 5: Solve for x
    x = 368,828.47/399.19
  6. Step 6: Final answer
    x = 923.95

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.