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Finding the Fourth Proportional to 770.75, 1,063.38 and 438.94

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Solution

The fourth proportional to 770.75, 1,063.38 and 438.94 is: 605.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.75 : 1,063.38 = 438.94 : x
  2. Step 2: Convert to fraction form
    770.75/1,063.38 = 438.94/x
  3. Step 3: Cross multiply
    770.75x = 1,063.38 × 438.94
  4. Step 4: Simplify right side
    770.75x = 466,757.82
  5. Step 5: Solve for x
    x = 466,757.82/770.75
  6. Step 6: Final answer
    x = 605.59

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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.