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Finding the Fourth Proportional to 1,331.83, 1,998 and 638.03

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Solution

The fourth proportional to 1,331.83, 1,998 and 638.03 is: 957.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.83 : 1,998 = 638.03 : x
  2. Step 2: Convert to fraction form
    1,331.83/1,998 = 638.03/x
  3. Step 3: Cross multiply
    1,331.83x = 1,998 × 638.03
  4. Step 4: Simplify right side
    1,331.83x = 1,274,783.94
  5. Step 5: Solve for x
    x = 1,274,783.94/1,331.83
  6. Step 6: Final answer
    x = 957.17

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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.