Home / 1,317.78-1,977.88-668.96

Finding the Fourth Proportional to 1,317.78, 1,977.88 and 668.96

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Solution

The fourth proportional to 1,317.78, 1,977.88 and 668.96 is: 1,004.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.78 : 1,977.88 = 668.96 : x
  2. Step 2: Convert to fraction form
    1,317.78/1,977.88 = 668.96/x
  3. Step 3: Cross multiply
    1,317.78x = 1,977.88 × 668.96
  4. Step 4: Simplify right side
    1,317.78x = 1,323,122.60
  5. Step 5: Solve for x
    x = 1,323,122.60/1,317.78
  6. Step 6: Final answer
    x = 1,004.05

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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.