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Finding the Fourth Proportional to 774.78, 1,069.14 and 443.20

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Solution

The fourth proportional to 774.78, 1,069.14 and 443.20 is: 611.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.78 : 1,069.14 = 443.20 : x
  2. Step 2: Convert to fraction form
    774.78/1,069.14 = 443.20/x
  3. Step 3: Cross multiply
    774.78x = 1,069.14 × 443.20
  4. Step 4: Simplify right side
    774.78x = 473,842.85
  5. Step 5: Solve for x
    x = 473,842.85/774.78
  6. Step 6: Final answer
    x = 611.58

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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.