Home / 1,081.18-1,621.59-311.50

Finding the Fourth Proportional to 1,081.18, 1,621.59 and 311.50

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Solution

The fourth proportional to 1,081.18, 1,621.59 and 311.50 is: 467.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.18 : 1,621.59 = 311.50 : x
  2. Step 2: Convert to fraction form
    1,081.18/1,621.59 = 311.50/x
  3. Step 3: Cross multiply
    1,081.18x = 1,621.59 × 311.50
  4. Step 4: Simplify right side
    1,081.18x = 505,125.29
  5. Step 5: Solve for x
    x = 505,125.29/1,081.18
  6. Step 6: Final answer
    x = 467.20

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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.