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Finding the Fourth Proportional to 1,258.69, 1,886.55 and 738.94

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Solution

The fourth proportional to 1,258.69, 1,886.55 and 738.94 is: 1,107.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.69 : 1,886.55 = 738.94 : x
  2. Step 2: Convert to fraction form
    1,258.69/1,886.55 = 738.94/x
  3. Step 3: Cross multiply
    1,258.69x = 1,886.55 × 738.94
  4. Step 4: Simplify right side
    1,258.69x = 1,394,047.26
  5. Step 5: Solve for x
    x = 1,394,047.26/1,258.69
  6. Step 6: Final answer
    x = 1,107.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.