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Finding the Fourth Proportional to 1,237.82, 1,707.39 and 818.15

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Solution

The fourth proportional to 1,237.82, 1,707.39 and 818.15 is: 1,128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.82 : 1,707.39 = 818.15 : x
  2. Step 2: Convert to fraction form
    1,237.82/1,707.39 = 818.15/x
  3. Step 3: Cross multiply
    1,237.82x = 1,707.39 × 818.15
  4. Step 4: Simplify right side
    1,237.82x = 1,396,892.59
  5. Step 5: Solve for x
    x = 1,396,892.59/1,237.82
  6. Step 6: Final answer
    x = 1,128.51

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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.