Home / 2,178.16-3,267.36-639.28

Finding the Fourth Proportional to 2,178.16, 3,267.36 and 639.28

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Solution

The fourth proportional to 2,178.16, 3,267.36 and 639.28 is: 958.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.16 : 3,267.36 = 639.28 : x
  2. Step 2: Convert to fraction form
    2,178.16/3,267.36 = 639.28/x
  3. Step 3: Cross multiply
    2,178.16x = 3,267.36 × 639.28
  4. Step 4: Simplify right side
    2,178.16x = 2,088,757.90
  5. Step 5: Solve for x
    x = 2,088,757.90/2,178.16
  6. Step 6: Final answer
    x = 958.96

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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.