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Finding the Fourth Proportional to 786.26, 1,082.57 and 667.99

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Solution

The fourth proportional to 786.26, 1,082.57 and 667.99 is: 919.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.26 : 1,082.57 = 667.99 : x
  2. Step 2: Convert to fraction form
    786.26/1,082.57 = 667.99/x
  3. Step 3: Cross multiply
    786.26x = 1,082.57 × 667.99
  4. Step 4: Simplify right side
    786.26x = 723,140.52
  5. Step 5: Solve for x
    x = 723,140.52/786.26
  6. Step 6: Final answer
    x = 919.72

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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.