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Finding the Fourth Proportional to 745.37, 1,118.18 and 258.30

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Solution

The fourth proportional to 745.37, 1,118.18 and 258.30 is: 387.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.37 : 1,118.18 = 258.30 : x
  2. Step 2: Convert to fraction form
    745.37/1,118.18 = 258.30/x
  3. Step 3: Cross multiply
    745.37x = 1,118.18 × 258.30
  4. Step 4: Simplify right side
    745.37x = 288,824.60
  5. Step 5: Solve for x
    x = 288,824.60/745.37
  6. Step 6: Final answer
    x = 387.49

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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.