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Finding the Fourth Proportional to 745.39, 1,118.49 and 312.85

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Solution

The fourth proportional to 745.39, 1,118.49 and 312.85 is: 469.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.39 : 1,118.49 = 312.85 : x
  2. Step 2: Convert to fraction form
    745.39/1,118.49 = 312.85/x
  3. Step 3: Cross multiply
    745.39x = 1,118.49 × 312.85
  4. Step 4: Simplify right side
    745.39x = 349,919.60
  5. Step 5: Solve for x
    x = 349,919.60/745.39
  6. Step 6: Final answer
    x = 469.44

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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.