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Finding the Fourth Proportional to 770.97, 1,063.82 and 490.71

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Solution

The fourth proportional to 770.97, 1,063.82 and 490.71 is: 677.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.97 : 1,063.82 = 490.71 : x
  2. Step 2: Convert to fraction form
    770.97/1,063.82 = 490.71/x
  3. Step 3: Cross multiply
    770.97x = 1,063.82 × 490.71
  4. Step 4: Simplify right side
    770.97x = 522,024.66
  5. Step 5: Solve for x
    x = 522,024.66/770.97
  6. Step 6: Final answer
    x = 677.10

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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.