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Finding the Fourth Proportional to 771.19, 1,064.31 and 439.56

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Solution

The fourth proportional to 771.19, 1,064.31 and 439.56 is: 606.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.19 : 1,064.31 = 439.56 : x
  2. Step 2: Convert to fraction form
    771.19/1,064.31 = 439.56/x
  3. Step 3: Cross multiply
    771.19x = 1,064.31 × 439.56
  4. Step 4: Simplify right side
    771.19x = 467,826.46
  5. Step 5: Solve for x
    x = 467,826.46/771.19
  6. Step 6: Final answer
    x = 606.63

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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.