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Finding the Fourth Proportional to 1,313.97, 1,971.54 and 665.16

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Solution

The fourth proportional to 1,313.97, 1,971.54 and 665.16 is: 998.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.97 : 1,971.54 = 665.16 : x
  2. Step 2: Convert to fraction form
    1,313.97/1,971.54 = 665.16/x
  3. Step 3: Cross multiply
    1,313.97x = 1,971.54 × 665.16
  4. Step 4: Simplify right side
    1,313.97x = 1,311,389.55
  5. Step 5: Solve for x
    x = 1,311,389.55/1,313.97
  6. Step 6: Final answer
    x = 998.04

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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.