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Finding the Fourth Proportional to 623.81, 861.08 and 438.32

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Solution

The fourth proportional to 623.81, 861.08 and 438.32 is: 605.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.81 : 861.08 = 438.32 : x
  2. Step 2: Convert to fraction form
    623.81/861.08 = 438.32/x
  3. Step 3: Cross multiply
    623.81x = 861.08 × 438.32
  4. Step 4: Simplify right side
    623.81x = 377,422.09
  5. Step 5: Solve for x
    x = 377,422.09/623.81
  6. Step 6: Final answer
    x = 605.03

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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.