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Finding the Fourth Proportional to 1,237.26, 1,707.70 and 817.68

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Solution

The fourth proportional to 1,237.26, 1,707.70 and 817.68 is: 1,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.26 : 1,707.70 = 817.68 : x
  2. Step 2: Convert to fraction form
    1,237.26/1,707.70 = 817.68/x
  3. Step 3: Cross multiply
    1,237.26x = 1,707.70 × 817.68
  4. Step 4: Simplify right side
    1,237.26x = 1,396,352.14
  5. Step 5: Solve for x
    x = 1,396,352.14/1,237.26
  6. Step 6: Final answer
    x = 1,128.58

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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.