Home / 2,638.40-3,957.35-1,078.45

Finding the Fourth Proportional to 2,638.40, 3,957.35 and 1,078.45

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Solution

The fourth proportional to 2,638.40, 3,957.35 and 1,078.45 is: 1,617.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.40 : 3,957.35 = 1,078.45 : x
  2. Step 2: Convert to fraction form
    2,638.40/3,957.35 = 1,078.45/x
  3. Step 3: Cross multiply
    2,638.40x = 3,957.35 × 1,078.45
  4. Step 4: Simplify right side
    2,638.40x = 4,267,788.82
  5. Step 5: Solve for x
    x = 4,267,788.82/2,638.40
  6. Step 6: Final answer
    x = 1,617.57

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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.