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Finding the Fourth Proportional to 571.28, 788.35 and 309.29

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Solution

The fourth proportional to 571.28, 788.35 and 309.29 is: 426.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.28 : 788.35 = 309.29 : x
  2. Step 2: Convert to fraction form
    571.28/788.35 = 309.29/x
  3. Step 3: Cross multiply
    571.28x = 788.35 × 309.29
  4. Step 4: Simplify right side
    571.28x = 243,828.77
  5. Step 5: Solve for x
    x = 243,828.77/571.28
  6. Step 6: Final answer
    x = 426.81

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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.