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Finding the Fourth Proportional to 745.35, 1,117.20 and 379.39

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Solution

The fourth proportional to 745.35, 1,117.20 and 379.39 is: 568.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.35 : 1,117.20 = 379.39 : x
  2. Step 2: Convert to fraction form
    745.35/1,117.20 = 379.39/x
  3. Step 3: Cross multiply
    745.35x = 1,117.20 × 379.39
  4. Step 4: Simplify right side
    745.35x = 423,854.51
  5. Step 5: Solve for x
    x = 423,854.51/745.35
  6. Step 6: Final answer
    x = 568.67

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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.