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Finding the Fourth Proportional to 1,317.38, 1,817.88 and 727.91

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Solution

The fourth proportional to 1,317.38, 1,817.88 and 727.91 is: 1,004.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.38 : 1,817.88 = 727.91 : x
  2. Step 2: Convert to fraction form
    1,317.38/1,817.88 = 727.91/x
  3. Step 3: Cross multiply
    1,317.38x = 1,817.88 × 727.91
  4. Step 4: Simplify right side
    1,317.38x = 1,323,258.25
  5. Step 5: Solve for x
    x = 1,323,258.25/1,317.38
  6. Step 6: Final answer
    x = 1,004.46

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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.