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Finding the Fourth Proportional to 779.21, 1,167.97 and 505.50

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Solution

The fourth proportional to 779.21, 1,167.97 and 505.50 is: 757.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.21 : 1,167.97 = 505.50 : x
  2. Step 2: Convert to fraction form
    779.21/1,167.97 = 505.50/x
  3. Step 3: Cross multiply
    779.21x = 1,167.97 × 505.50
  4. Step 4: Simplify right side
    779.21x = 590,408.84
  5. Step 5: Solve for x
    x = 590,408.84/779.21
  6. Step 6: Final answer
    x = 757.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.