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Finding the Fourth Proportional to 1,317.28, 1,817.79 and 727.81

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Solution

The fourth proportional to 1,317.28, 1,817.79 and 727.81 is: 1,004.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.28 : 1,817.79 = 727.81 : x
  2. Step 2: Convert to fraction form
    1,317.28/1,817.79 = 727.81/x
  3. Step 3: Cross multiply
    1,317.28x = 1,817.79 × 727.81
  4. Step 4: Simplify right side
    1,317.28x = 1,323,005.74
  5. Step 5: Solve for x
    x = 1,323,005.74/1,317.28
  6. Step 6: Final answer
    x = 1,004.35

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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.