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Finding the Fourth Proportional to 745.62, 1,112.98 and 691.41

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Solution

The fourth proportional to 745.62, 1,112.98 and 691.41 is: 1,032.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.62 : 1,112.98 = 691.41 : x
  2. Step 2: Convert to fraction form
    745.62/1,112.98 = 691.41/x
  3. Step 3: Cross multiply
    745.62x = 1,112.98 × 691.41
  4. Step 4: Simplify right side
    745.62x = 769,522.04
  5. Step 5: Solve for x
    x = 769,522.04/745.62
  6. Step 6: Final answer
    x = 1,032.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.