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Finding the Fourth Proportional to 745.25, 1,028.49 and 434.75

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Solution

The fourth proportional to 745.25, 1,028.49 and 434.75 is: 599.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.25 : 1,028.49 = 434.75 : x
  2. Step 2: Convert to fraction form
    745.25/1,028.49 = 434.75/x
  3. Step 3: Cross multiply
    745.25x = 1,028.49 × 434.75
  4. Step 4: Simplify right side
    745.25x = 447,136.03
  5. Step 5: Solve for x
    x = 447,136.03/745.25
  6. Step 6: Final answer
    x = 599.98

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Double scale
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1.5x scale

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.