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Finding the Fourth Proportional to 1,317.56, 1,978.16 and 668.75

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Solution

The fourth proportional to 1,317.56, 1,978.16 and 668.75 is: 1,004.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.56 : 1,978.16 = 668.75 : x
  2. Step 2: Convert to fraction form
    1,317.56/1,978.16 = 668.75/x
  3. Step 3: Cross multiply
    1,317.56x = 1,978.16 × 668.75
  4. Step 4: Simplify right side
    1,317.56x = 1,322,881.27
  5. Step 5: Solve for x
    x = 1,322,881.27/1,317.56
  6. Step 6: Final answer
    x = 1,004.04

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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.