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Finding the Fourth Proportional to 745.31, 1,028.67 and 430.78

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Solution

The fourth proportional to 745.31, 1,028.67 and 430.78 is: 594.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.31 : 1,028.67 = 430.78 : x
  2. Step 2: Convert to fraction form
    745.31/1,028.67 = 430.78/x
  3. Step 3: Cross multiply
    745.31x = 1,028.67 × 430.78
  4. Step 4: Simplify right side
    745.31x = 443,127.89
  5. Step 5: Solve for x
    x = 443,127.89/745.31
  6. Step 6: Final answer
    x = 594.55

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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.