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Finding the Fourth Proportional to 623.82, 861.12 and 449.40

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Solution

The fourth proportional to 623.82, 861.12 and 449.40 is: 620.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.82 : 861.12 = 449.40 : x
  2. Step 2: Convert to fraction form
    623.82/861.12 = 449.40/x
  3. Step 3: Cross multiply
    623.82x = 861.12 × 449.40
  4. Step 4: Simplify right side
    623.82x = 386,987.33
  5. Step 5: Solve for x
    x = 386,987.33/623.82
  6. Step 6: Final answer
    x = 620.35

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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.