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Finding the Fourth Proportional to 936.90, 1,405.80 and 320.67

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Solution

The fourth proportional to 936.90, 1,405.80 and 320.67 is: 481.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,405.80 = 320.67 : x
  2. Step 2: Convert to fraction form
    936.90/1,405.80 = 320.67/x
  3. Step 3: Cross multiply
    936.90x = 1,405.80 × 320.67
  4. Step 4: Simplify right side
    936.90x = 450,797.89
  5. Step 5: Solve for x
    x = 450,797.89/936.90
  6. Step 6: Final answer
    x = 481.16

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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.