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Finding the Fourth Proportional to 571.22, 788.28 and 309.23

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Solution

The fourth proportional to 571.22, 788.28 and 309.23 is: 426.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.22 : 788.28 = 309.23 : x
  2. Step 2: Convert to fraction form
    571.22/788.28 = 309.23/x
  3. Step 3: Cross multiply
    571.22x = 788.28 × 309.23
  4. Step 4: Simplify right side
    571.22x = 243,763.85
  5. Step 5: Solve for x
    x = 243,763.85/571.22
  6. Step 6: Final answer
    x = 426.74

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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.