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Finding the Third Proportional to 485.81 and 745.03

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Solution

The third proportional to 485.81 and 745.03 is: 1,142.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.81 : 745.03 = 745.03 : x
  2. Step 2: Convert to fraction form
    485.81/745.03 = 745.03/x
  3. Step 3: Cross multiply
    485.81x = 745.03 × 745.03
  4. Step 4: Simplify right side
    485.81x = 555,071.56
  5. Step 5: Solve for x
    x = 555,071.56/485.81
  6. Step 6: Final answer
    x = 1,142.56

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.