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Finding the Fourth Proportional to 455.31, 682.04 and 421.59

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Solution

The fourth proportional to 455.31, 682.04 and 421.59 is: 631.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.31 : 682.04 = 421.59 : x
  2. Step 2: Convert to fraction form
    455.31/682.04 = 421.59/x
  3. Step 3: Cross multiply
    455.31x = 682.04 × 421.59
  4. Step 4: Simplify right side
    455.31x = 287,539.14
  5. Step 5: Solve for x
    x = 287,539.14/455.31
  6. Step 6: Final answer
    x = 631.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.