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Finding the Fourth Proportional to 745.35, 1,115.80 and 727.67

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Solution

The fourth proportional to 745.35, 1,115.80 and 727.67 is: 1,089.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.35 : 1,115.80 = 727.67 : x
  2. Step 2: Convert to fraction form
    745.35/1,115.80 = 727.67/x
  3. Step 3: Cross multiply
    745.35x = 1,115.80 × 727.67
  4. Step 4: Simplify right side
    745.35x = 811,934.19
  5. Step 5: Solve for x
    x = 811,934.19/745.35
  6. Step 6: Final answer
    x = 1,089.33

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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.