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Finding the Fourth Proportional to 1,396.13, 1,926.63 and 766.65

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Solution

The fourth proportional to 1,396.13, 1,926.63 and 766.65 is: 1,057.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.13 : 1,926.63 = 766.65 : x
  2. Step 2: Convert to fraction form
    1,396.13/1,926.63 = 766.65/x
  3. Step 3: Cross multiply
    1,396.13x = 1,926.63 × 766.65
  4. Step 4: Simplify right side
    1,396.13x = 1,477,039.70
  5. Step 5: Solve for x
    x = 1,477,039.70/1,396.13
  6. Step 6: Final answer
    x = 1,057.95

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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.