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Finding the Fourth Proportional to 745.61, 1,028.31 and 480.09

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Solution

The fourth proportional to 745.61, 1,028.31 and 480.09 is: 662.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.61 : 1,028.31 = 480.09 : x
  2. Step 2: Convert to fraction form
    745.61/1,028.31 = 480.09/x
  3. Step 3: Cross multiply
    745.61x = 1,028.31 × 480.09
  4. Step 4: Simplify right side
    745.61x = 493,681.35
  5. Step 5: Solve for x
    x = 493,681.35/745.61
  6. Step 6: Final answer
    x = 662.12

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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.