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Finding the Fourth Proportional to 771.61, 1,064.82 and 422.30

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Solution

The fourth proportional to 771.61, 1,064.82 and 422.30 is: 582.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.61 : 1,064.82 = 422.30 : x
  2. Step 2: Convert to fraction form
    771.61/1,064.82 = 422.30/x
  3. Step 3: Cross multiply
    771.61x = 1,064.82 × 422.30
  4. Step 4: Simplify right side
    771.61x = 449,673.49
  5. Step 5: Solve for x
    x = 449,673.49/771.61
  6. Step 6: Final answer
    x = 582.77

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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.