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Finding the Fourth Proportional to 571.31, 788.49 and 454.21

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Solution

The fourth proportional to 571.31, 788.49 and 454.21 is: 626.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.31 : 788.49 = 454.21 : x
  2. Step 2: Convert to fraction form
    571.31/788.49 = 454.21/x
  3. Step 3: Cross multiply
    571.31x = 788.49 × 454.21
  4. Step 4: Simplify right side
    571.31x = 358,140.04
  5. Step 5: Solve for x
    x = 358,140.04/571.31
  6. Step 6: Final answer
    x = 626.88

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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.