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Finding the Fourth Proportional to 1,308.33, 1,806.92 and 812.16

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Solution

The fourth proportional to 1,308.33, 1,806.92 and 812.16 is: 1,121.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.33 : 1,806.92 = 812.16 : x
  2. Step 2: Convert to fraction form
    1,308.33/1,806.92 = 812.16/x
  3. Step 3: Cross multiply
    1,308.33x = 1,806.92 × 812.16
  4. Step 4: Simplify right side
    1,308.33x = 1,467,508.15
  5. Step 5: Solve for x
    x = 1,467,508.15/1,308.33
  6. Step 6: Final answer
    x = 1,121.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.