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Finding the Fourth Proportional to 772.44, 1,064.79 and 667.05

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Solution

The fourth proportional to 772.44, 1,064.79 and 667.05 is: 919.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.44 : 1,064.79 = 667.05 : x
  2. Step 2: Convert to fraction form
    772.44/1,064.79 = 667.05/x
  3. Step 3: Cross multiply
    772.44x = 1,064.79 × 667.05
  4. Step 4: Simplify right side
    772.44x = 710,268.17
  5. Step 5: Solve for x
    x = 710,268.17/772.44
  6. Step 6: Final answer
    x = 919.51

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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.