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Finding the Fourth Proportional to 771.11, 1,064.13 and 439.53

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Solution

The fourth proportional to 771.11, 1,064.13 and 439.53 is: 606.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.11 : 1,064.13 = 439.53 : x
  2. Step 2: Convert to fraction form
    771.11/1,064.13 = 439.53/x
  3. Step 3: Cross multiply
    771.11x = 1,064.13 × 439.53
  4. Step 4: Simplify right side
    771.11x = 467,717.06
  5. Step 5: Solve for x
    x = 467,717.06/771.11
  6. Step 6: Final answer
    x = 606.55

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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.