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Finding the Fourth Proportional to 454.82, 625.73 and 389.21

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Solution

The fourth proportional to 454.82, 625.73 and 389.21 is: 535.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.82 : 625.73 = 389.21 : x
  2. Step 2: Convert to fraction form
    454.82/625.73 = 389.21/x
  3. Step 3: Cross multiply
    454.82x = 625.73 × 389.21
  4. Step 4: Simplify right side
    454.82x = 243,535.30
  5. Step 5: Solve for x
    x = 243,535.30/454.82
  6. Step 6: Final answer
    x = 535.46

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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.