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Finding the Fourth Proportional to 950.85, 1,311.75 and 619.20

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Solution

The fourth proportional to 950.85, 1,311.75 and 619.20 is: 854.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.85 : 1,311.75 = 619.20 : x
  2. Step 2: Convert to fraction form
    950.85/1,311.75 = 619.20/x
  3. Step 3: Cross multiply
    950.85x = 1,311.75 × 619.20
  4. Step 4: Simplify right side
    950.85x = 812,235.60
  5. Step 5: Solve for x
    x = 812,235.60/950.85
  6. Step 6: Final answer
    x = 854.22

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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.