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Finding the Fourth Proportional to 623.67, 935.40 and 213.09

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Solution

The fourth proportional to 623.67, 935.40 and 213.09 is: 319.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.67 : 935.40 = 213.09 : x
  2. Step 2: Convert to fraction form
    623.67/935.40 = 213.09/x
  3. Step 3: Cross multiply
    623.67x = 935.40 × 213.09
  4. Step 4: Simplify right side
    623.67x = 199,324.39
  5. Step 5: Solve for x
    x = 199,324.39/623.67
  6. Step 6: Final answer
    x = 319.60

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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.