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Finding the Fourth Proportional to 771.33, 1,064.45 and 422.03

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Solution

The fourth proportional to 771.33, 1,064.45 and 422.03 is: 582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.33 : 1,064.45 = 422.03 : x
  2. Step 2: Convert to fraction form
    771.33/1,064.45 = 422.03/x
  3. Step 3: Cross multiply
    771.33x = 1,064.45 × 422.03
  4. Step 4: Simplify right side
    771.33x = 449,222.40
  5. Step 5: Solve for x
    x = 449,222.40/771.33
  6. Step 6: Final answer
    x = 582.40

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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.