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Finding the Fourth Proportional to 745.75, 1,029.20 and 414.28

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Solution

The fourth proportional to 745.75, 1,029.20 and 414.28 is: 571.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.75 : 1,029.20 = 414.28 : x
  2. Step 2: Convert to fraction form
    745.75/1,029.20 = 414.28/x
  3. Step 3: Cross multiply
    745.75x = 1,029.20 × 414.28
  4. Step 4: Simplify right side
    745.75x = 426,376.19
  5. Step 5: Solve for x
    x = 426,376.19/745.75
  6. Step 6: Final answer
    x = 571.74

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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.