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Finding the Fourth Proportional to 950, 1,311.12 and 640.16

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Solution

The fourth proportional to 950, 1,311.12 and 640.16 is: 883.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    950 : 1,311.12 = 640.16 : x
  2. Step 2: Convert to fraction form
    950/1,311.12 = 640.16/x
  3. Step 3: Cross multiply
    950x = 1,311.12 × 640.16
  4. Step 4: Simplify right side
    950x = 839,326.58
  5. Step 5: Solve for x
    x = 839,326.58/950
  6. Step 6: Final answer
    x = 883.50

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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.