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Finding the Fourth Proportional to 774.81, 1,069.11 and 443.21

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Solution

The fourth proportional to 774.81, 1,069.11 and 443.21 is: 611.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.81 : 1,069.11 = 443.21 : x
  2. Step 2: Convert to fraction form
    774.81/1,069.11 = 443.21/x
  3. Step 3: Cross multiply
    774.81x = 1,069.11 × 443.21
  4. Step 4: Simplify right side
    774.81x = 473,834.90
  5. Step 5: Solve for x
    x = 473,834.90/774.81
  6. Step 6: Final answer
    x = 611.55

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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.