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Finding the Fourth Proportional to 745.43, 1,028.92 and 430.90

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Solution

The fourth proportional to 745.43, 1,028.92 and 430.90 is: 594.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.43 : 1,028.92 = 430.90 : x
  2. Step 2: Convert to fraction form
    745.43/1,028.92 = 430.90/x
  3. Step 3: Cross multiply
    745.43x = 1,028.92 × 430.90
  4. Step 4: Simplify right side
    745.43x = 443,361.63
  5. Step 5: Solve for x
    x = 443,361.63/745.43
  6. Step 6: Final answer
    x = 594.77

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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.