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Finding the Fourth Proportional to 779.21, 1,168.61 and 449.45

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Solution

The fourth proportional to 779.21, 1,168.61 and 449.45 is: 674.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.21 : 1,168.61 = 449.45 : x
  2. Step 2: Convert to fraction form
    779.21/1,168.61 = 449.45/x
  3. Step 3: Cross multiply
    779.21x = 1,168.61 × 449.45
  4. Step 4: Simplify right side
    779.21x = 525,225.92
  5. Step 5: Solve for x
    x = 525,225.92/779.21
  6. Step 6: Final answer
    x = 674.05

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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.