Home / 1,317.54-1,976.31-393.15

Finding the Fourth Proportional to 1,317.54, 1,976.31 and 393.15

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Solution

The fourth proportional to 1,317.54, 1,976.31 and 393.15 is: 589.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.54 : 1,976.31 = 393.15 : x
  2. Step 2: Convert to fraction form
    1,317.54/1,976.31 = 393.15/x
  3. Step 3: Cross multiply
    1,317.54x = 1,976.31 × 393.15
  4. Step 4: Simplify right side
    1,317.54x = 776,986.28
  5. Step 5: Solve for x
    x = 776,986.28/1,317.54
  6. Step 6: Final answer
    x = 589.73

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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.