Home / 1,317.12-1,974.96-668.40

Finding the Fourth Proportional to 1,317.12, 1,974.96 and 668.40

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Solution

The fourth proportional to 1,317.12, 1,974.96 and 668.40 is: 1,002.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.12 : 1,974.96 = 668.40 : x
  2. Step 2: Convert to fraction form
    1,317.12/1,974.96 = 668.40/x
  3. Step 3: Cross multiply
    1,317.12x = 1,974.96 × 668.40
  4. Step 4: Simplify right side
    1,317.12x = 1,320,063.26
  5. Step 5: Solve for x
    x = 1,320,063.26/1,317.12
  6. Step 6: Final answer
    x = 1,002.23

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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.