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Finding the Fourth Proportional to 745.65, 1,028.98 and 409.55

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Solution

The fourth proportional to 745.65, 1,028.98 and 409.55 is: 565.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.65 : 1,028.98 = 409.55 : x
  2. Step 2: Convert to fraction form
    745.65/1,028.98 = 409.55/x
  3. Step 3: Cross multiply
    745.65x = 1,028.98 × 409.55
  4. Step 4: Simplify right side
    745.65x = 421,418.76
  5. Step 5: Solve for x
    x = 421,418.76/745.65
  6. Step 6: Final answer
    x = 565.17

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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.