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Finding the Fourth Proportional to 745.81, 1,028.30 and 612.56

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Solution

The fourth proportional to 745.81, 1,028.30 and 612.56 is: 844.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.81 : 1,028.30 = 612.56 : x
  2. Step 2: Convert to fraction form
    745.81/1,028.30 = 612.56/x
  3. Step 3: Cross multiply
    745.81x = 1,028.30 × 612.56
  4. Step 4: Simplify right side
    745.81x = 629,894.96
  5. Step 5: Solve for x
    x = 629,894.96/745.81
  6. Step 6: Final answer
    x = 844.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.