Home / 1,317.96-1,976.40-393.18

Finding the Fourth Proportional to 1,317.96, 1,976.40 and 393.18

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Solution

The fourth proportional to 1,317.96, 1,976.40 and 393.18 is: 589.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.96 : 1,976.40 = 393.18 : x
  2. Step 2: Convert to fraction form
    1,317.96/1,976.40 = 393.18/x
  3. Step 3: Cross multiply
    1,317.96x = 1,976.40 × 393.18
  4. Step 4: Simplify right side
    1,317.96x = 777,080.95
  5. Step 5: Solve for x
    x = 777,080.95/1,317.96
  6. Step 6: Final answer
    x = 589.61

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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.