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Finding the Fourth Proportional to 1,317.76, 1,976.91 and 393.37

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Solution

The fourth proportional to 1,317.76, 1,976.91 and 393.37 is: 590.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.76 : 1,976.91 = 393.37 : x
  2. Step 2: Convert to fraction form
    1,317.76/1,976.91 = 393.37/x
  3. Step 3: Cross multiply
    1,317.76x = 1,976.91 × 393.37
  4. Step 4: Simplify right side
    1,317.76x = 777,657.09
  5. Step 5: Solve for x
    x = 777,657.09/1,317.76
  6. Step 6: Final answer
    x = 590.14

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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.