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Finding the Fourth Proportional to 1,317.47, 1,817.94 and 727.99

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Solution

The fourth proportional to 1,317.47, 1,817.94 and 727.99 is: 1,004.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.47 : 1,817.94 = 727.99 : x
  2. Step 2: Convert to fraction form
    1,317.47/1,817.94 = 727.99/x
  3. Step 3: Cross multiply
    1,317.47x = 1,817.94 × 727.99
  4. Step 4: Simplify right side
    1,317.47x = 1,323,440.33
  5. Step 5: Solve for x
    x = 1,323,440.33/1,317.47
  6. Step 6: Final answer
    x = 1,004.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.