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Finding the Fourth Proportional to 634.87, 875.51 and 449.31

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Solution

The fourth proportional to 634.87, 875.51 and 449.31 is: 619.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.87 : 875.51 = 449.31 : x
  2. Step 2: Convert to fraction form
    634.87/875.51 = 449.31/x
  3. Step 3: Cross multiply
    634.87x = 875.51 × 449.31
  4. Step 4: Simplify right side
    634.87x = 393,378.12
  5. Step 5: Solve for x
    x = 393,378.12/634.87
  6. Step 6: Final answer
    x = 619.62

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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.