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Finding the Fourth Proportional to 776.24, 1,071.20 and 422.17

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Solution

The fourth proportional to 776.24, 1,071.20 and 422.17 is: 582.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.24 : 1,071.20 = 422.17 : x
  2. Step 2: Convert to fraction form
    776.24/1,071.20 = 422.17/x
  3. Step 3: Cross multiply
    776.24x = 1,071.20 × 422.17
  4. Step 4: Simplify right side
    776.24x = 452,229.32
  5. Step 5: Solve for x
    x = 452,229.32/776.24
  6. Step 6: Final answer
    x = 582.59

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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.