Home / 1,317.92-1,976.96-393.60

Finding the Fourth Proportional to 1,317.92, 1,976.96 and 393.60

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Solution

The fourth proportional to 1,317.92, 1,976.96 and 393.60 is: 590.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.92 : 1,976.96 = 393.60 : x
  2. Step 2: Convert to fraction form
    1,317.92/1,976.96 = 393.60/x
  3. Step 3: Cross multiply
    1,317.92x = 1,976.96 × 393.60
  4. Step 4: Simplify right side
    1,317.92x = 778,131.46
  5. Step 5: Solve for x
    x = 778,131.46/1,317.92
  6. Step 6: Final answer
    x = 590.42

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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.