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Finding the Fourth Proportional to 571.28, 788.31 and 322.61

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Solution

The fourth proportional to 571.28, 788.31 and 322.61 is: 445.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.28 : 788.31 = 322.61 : x
  2. Step 2: Convert to fraction form
    571.28/788.31 = 322.61/x
  3. Step 3: Cross multiply
    571.28x = 788.31 × 322.61
  4. Step 4: Simplify right side
    571.28x = 254,312.75
  5. Step 5: Solve for x
    x = 254,312.75/571.28
  6. Step 6: Final answer
    x = 445.17

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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.