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Finding the Fourth Proportional to 1,076.78, 1,603.58 and 1,040.32

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Solution

The fourth proportional to 1,076.78, 1,603.58 and 1,040.32 is: 1,549.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.78 : 1,603.58 = 1,040.32 : x
  2. Step 2: Convert to fraction form
    1,076.78/1,603.58 = 1,040.32/x
  3. Step 3: Cross multiply
    1,076.78x = 1,603.58 × 1,040.32
  4. Step 4: Simplify right side
    1,076.78x = 1,668,236.35
  5. Step 5: Solve for x
    x = 1,668,236.35/1,076.78
  6. Step 6: Final answer
    x = 1,549.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.