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Finding the Fourth Proportional to 1,317.12, 1,817.63 and 727.65

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Solution

The fourth proportional to 1,317.12, 1,817.63 and 727.65 is: 1,004.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.12 : 1,817.63 = 727.65 : x
  2. Step 2: Convert to fraction form
    1,317.12/1,817.63 = 727.65/x
  3. Step 3: Cross multiply
    1,317.12x = 1,817.63 × 727.65
  4. Step 4: Simplify right side
    1,317.12x = 1,322,594.83
  5. Step 5: Solve for x
    x = 1,322,594.83/1,317.12
  6. Step 6: Final answer
    x = 1,004.16

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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.