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Finding the Fourth Proportional to 745.65, 1,028.91 and 414.09

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Solution

The fourth proportional to 745.65, 1,028.91 and 414.09 is: 571.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.65 : 1,028.91 = 414.09 : x
  2. Step 2: Convert to fraction form
    745.65/1,028.91 = 414.09/x
  3. Step 3: Cross multiply
    745.65x = 1,028.91 × 414.09
  4. Step 4: Simplify right side
    745.65x = 426,061.34
  5. Step 5: Solve for x
    x = 426,061.34/745.65
  6. Step 6: Final answer
    x = 571.40

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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.