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Finding the Fourth Proportional to 1,396.77, 1,928.45 and 866.22

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Solution

The fourth proportional to 1,396.77, 1,928.45 and 866.22 is: 1,195.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.77 : 1,928.45 = 866.22 : x
  2. Step 2: Convert to fraction form
    1,396.77/1,928.45 = 866.22/x
  3. Step 3: Cross multiply
    1,396.77x = 1,928.45 × 866.22
  4. Step 4: Simplify right side
    1,396.77x = 1,670,455.64
  5. Step 5: Solve for x
    x = 1,670,455.64/1,396.77
  6. Step 6: Final answer
    x = 1,195.94

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1.5x scale

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.