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Finding the Fourth Proportional to 745.22, 1,028.50 and 620.66

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Solution

The fourth proportional to 745.22, 1,028.50 and 620.66 is: 856.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.22 : 1,028.50 = 620.66 : x
  2. Step 2: Convert to fraction form
    745.22/1,028.50 = 620.66/x
  3. Step 3: Cross multiply
    745.22x = 1,028.50 × 620.66
  4. Step 4: Simplify right side
    745.22x = 638,348.81
  5. Step 5: Solve for x
    x = 638,348.81/745.22
  6. Step 6: Final answer
    x = 856.59

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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.