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Finding the Fourth Proportional to 819.96, 1,131.40 and 679.56

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Solution

The fourth proportional to 819.96, 1,131.40 and 679.56 is: 937.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.96 : 1,131.40 = 679.56 : x
  2. Step 2: Convert to fraction form
    819.96/1,131.40 = 679.56/x
  3. Step 3: Cross multiply
    819.96x = 1,131.40 × 679.56
  4. Step 4: Simplify right side
    819.96x = 768,854.18
  5. Step 5: Solve for x
    x = 768,854.18/819.96
  6. Step 6: Final answer
    x = 937.67

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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.