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Finding the Fourth Proportional to 771.68, 1,158 and 406.64

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Solution

The fourth proportional to 771.68, 1,158 and 406.64 is: 610.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.68 : 1,158 = 406.64 : x
  2. Step 2: Convert to fraction form
    771.68/1,158 = 406.64/x
  3. Step 3: Cross multiply
    771.68x = 1,158 × 406.64
  4. Step 4: Simplify right side
    771.68x = 470,889.12
  5. Step 5: Solve for x
    x = 470,889.12/771.68
  6. Step 6: Final answer
    x = 610.21

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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.