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Finding the Fourth Proportional to 1,331.09, 1,993.58 and 638.24

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Solution

The fourth proportional to 1,331.09, 1,993.58 and 638.24 is: 955.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.09 : 1,993.58 = 638.24 : x
  2. Step 2: Convert to fraction form
    1,331.09/1,993.58 = 638.24/x
  3. Step 3: Cross multiply
    1,331.09x = 1,993.58 × 638.24
  4. Step 4: Simplify right side
    1,331.09x = 1,272,372.53
  5. Step 5: Solve for x
    x = 1,272,372.53/1,331.09
  6. Step 6: Final answer
    x = 955.89

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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.