Home / 1,086.20-1,629.18-316.70

Finding the Fourth Proportional to 1,086.20, 1,629.18 and 316.70

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Solution

The fourth proportional to 1,086.20, 1,629.18 and 316.70 is: 475.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.20 : 1,629.18 = 316.70 : x
  2. Step 2: Convert to fraction form
    1,086.20/1,629.18 = 316.70/x
  3. Step 3: Cross multiply
    1,086.20x = 1,629.18 × 316.70
  4. Step 4: Simplify right side
    1,086.20x = 515,961.31
  5. Step 5: Solve for x
    x = 515,961.31/1,086.20
  6. Step 6: Final answer
    x = 475.02

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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.