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Finding the Fourth Proportional to 1,388, 1,915.48 and 767.04

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Solution

The fourth proportional to 1,388, 1,915.48 and 767.04 is: 1,058.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 1,915.48 = 767.04 : x
  2. Step 2: Convert to fraction form
    1,388/1,915.48 = 767.04/x
  3. Step 3: Cross multiply
    1,388x = 1,915.48 × 767.04
  4. Step 4: Simplify right side
    1,388x = 1,469,249.78
  5. Step 5: Solve for x
    x = 1,469,249.78/1,388
  6. Step 6: Final answer
    x = 1,058.54

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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.