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Finding the Fourth Proportional to 1,231.39, 1,697.75 and 788.54

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Solution

The fourth proportional to 1,231.39, 1,697.75 and 788.54 is: 1,087.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.39 : 1,697.75 = 788.54 : x
  2. Step 2: Convert to fraction form
    1,231.39/1,697.75 = 788.54/x
  3. Step 3: Cross multiply
    1,231.39x = 1,697.75 × 788.54
  4. Step 4: Simplify right side
    1,231.39x = 1,338,743.79
  5. Step 5: Solve for x
    x = 1,338,743.79/1,231.39
  6. Step 6: Final answer
    x = 1,087.19

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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.