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Finding the Fourth Proportional to 745.22, 1,028.61 and 434.78

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Solution

The fourth proportional to 745.22, 1,028.61 and 434.78 is: 600.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.22 : 1,028.61 = 434.78 : x
  2. Step 2: Convert to fraction form
    745.22/1,028.61 = 434.78/x
  3. Step 3: Cross multiply
    745.22x = 1,028.61 × 434.78
  4. Step 4: Simplify right side
    745.22x = 447,219.06
  5. Step 5: Solve for x
    x = 447,219.06/745.22
  6. Step 6: Final answer
    x = 600.12

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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.