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Finding the Fourth Proportional to 745.90, 1,118.82 and 259.30

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Solution

The fourth proportional to 745.90, 1,118.82 and 259.30 is: 388.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.90 : 1,118.82 = 259.30 : x
  2. Step 2: Convert to fraction form
    745.90/1,118.82 = 259.30/x
  3. Step 3: Cross multiply
    745.90x = 1,118.82 × 259.30
  4. Step 4: Simplify right side
    745.90x = 290,110.03
  5. Step 5: Solve for x
    x = 290,110.03/745.90
  6. Step 6: Final answer
    x = 388.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.