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Finding the Fourth Proportional to 774.84, 1,069.31 and 443.18

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Solution

The fourth proportional to 774.84, 1,069.31 and 443.18 is: 611.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.84 : 1,069.31 = 443.18 : x
  2. Step 2: Convert to fraction form
    774.84/1,069.31 = 443.18/x
  3. Step 3: Cross multiply
    774.84x = 1,069.31 × 443.18
  4. Step 4: Simplify right side
    774.84x = 473,896.81
  5. Step 5: Solve for x
    x = 473,896.81/774.84
  6. Step 6: Final answer
    x = 611.61

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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.