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Finding the Fourth Proportional to 771.27, 1,064.36 and 421.95

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Solution

The fourth proportional to 771.27, 1,064.36 and 421.95 is: 582.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.27 : 1,064.36 = 421.95 : x
  2. Step 2: Convert to fraction form
    771.27/1,064.36 = 421.95/x
  3. Step 3: Cross multiply
    771.27x = 1,064.36 × 421.95
  4. Step 4: Simplify right side
    771.27x = 449,107.25
  5. Step 5: Solve for x
    x = 449,107.25/771.27
  6. Step 6: Final answer
    x = 582.30

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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.