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Finding the Fourth Proportional to 771.15, 1,064.11 and 439.49

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Solution

The fourth proportional to 771.15, 1,064.11 and 439.49 is: 606.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.15 : 1,064.11 = 439.49 : x
  2. Step 2: Convert to fraction form
    771.15/1,064.11 = 439.49/x
  3. Step 3: Cross multiply
    771.15x = 1,064.11 × 439.49
  4. Step 4: Simplify right side
    771.15x = 467,664.84
  5. Step 5: Solve for x
    x = 467,664.84/771.15
  6. Step 6: Final answer
    x = 606.45

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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.