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Finding the Fourth Proportional to 745.78, 1,029.12 and 414.18

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Solution

The fourth proportional to 745.78, 1,029.12 and 414.18 is: 571.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.78 : 1,029.12 = 414.18 : x
  2. Step 2: Convert to fraction form
    745.78/1,029.12 = 414.18/x
  3. Step 3: Cross multiply
    745.78x = 1,029.12 × 414.18
  4. Step 4: Simplify right side
    745.78x = 426,240.92
  5. Step 5: Solve for x
    x = 426,240.92/745.78
  6. Step 6: Final answer
    x = 571.54

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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.