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Finding the Fourth Proportional to 1,321.84, 1,980.96 and 736

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Solution

The fourth proportional to 1,321.84, 1,980.96 and 736 is: 1,103.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.84 : 1,980.96 = 736 : x
  2. Step 2: Convert to fraction form
    1,321.84/1,980.96 = 736/x
  3. Step 3: Cross multiply
    1,321.84x = 1,980.96 × 736
  4. Step 4: Simplify right side
    1,321.84x = 1,457,986.56
  5. Step 5: Solve for x
    x = 1,457,986.56/1,321.84
  6. Step 6: Final answer
    x = 1,103.00

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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.