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Finding the Fourth Proportional to 771.12, 1,064.24 and 439.56

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Solution

The fourth proportional to 771.12, 1,064.24 and 439.56 is: 606.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.12 : 1,064.24 = 439.56 : x
  2. Step 2: Convert to fraction form
    771.12/1,064.24 = 439.56/x
  3. Step 3: Cross multiply
    771.12x = 1,064.24 × 439.56
  4. Step 4: Simplify right side
    771.12x = 467,797.33
  5. Step 5: Solve for x
    x = 467,797.33/771.12
  6. Step 6: Final answer
    x = 606.65

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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.