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Finding the Fourth Proportional to 745.22, 1,110.80 and 689.84

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Solution

The fourth proportional to 745.22, 1,110.80 and 689.84 is: 1,028.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.22 : 1,110.80 = 689.84 : x
  2. Step 2: Convert to fraction form
    745.22/1,110.80 = 689.84/x
  3. Step 3: Cross multiply
    745.22x = 1,110.80 × 689.84
  4. Step 4: Simplify right side
    745.22x = 766,274.27
  5. Step 5: Solve for x
    x = 766,274.27/745.22
  6. Step 6: Final answer
    x = 1,028.25

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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.