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Finding the Fourth Proportional to 745.42, 1,028.70 and 496.57

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Solution

The fourth proportional to 745.42, 1,028.70 and 496.57 is: 685.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.42 : 1,028.70 = 496.57 : x
  2. Step 2: Convert to fraction form
    745.42/1,028.70 = 496.57/x
  3. Step 3: Cross multiply
    745.42x = 1,028.70 × 496.57
  4. Step 4: Simplify right side
    745.42x = 510,816.42
  5. Step 5: Solve for x
    x = 510,816.42/745.42
  6. Step 6: Final answer
    x = 685.28

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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.