Home / 1,285.19-1,927.80-311.30

Finding the Fourth Proportional to 1,285.19, 1,927.80 and 311.30

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Solution

The fourth proportional to 1,285.19, 1,927.80 and 311.30 is: 466.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.19 : 1,927.80 = 311.30 : x
  2. Step 2: Convert to fraction form
    1,285.19/1,927.80 = 311.30/x
  3. Step 3: Cross multiply
    1,285.19x = 1,927.80 × 311.30
  4. Step 4: Simplify right side
    1,285.19x = 600,128.96
  5. Step 5: Solve for x
    x = 600,128.96/1,285.19
  6. Step 6: Final answer
    x = 466.96

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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.