Home / 2,156.80-2,976.16-1,272.64

Finding the Fourth Proportional to 2,156.80, 2,976.16 and 1,272.64

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Solution

The fourth proportional to 2,156.80, 2,976.16 and 1,272.64 is: 1,756.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.80 : 2,976.16 = 1,272.64 : x
  2. Step 2: Convert to fraction form
    2,156.80/2,976.16 = 1,272.64/x
  3. Step 3: Cross multiply
    2,156.80x = 2,976.16 × 1,272.64
  4. Step 4: Simplify right side
    2,156.80x = 3,787,580.26
  5. Step 5: Solve for x
    x = 3,787,580.26/2,156.80
  6. Step 6: Final answer
    x = 1,756.11

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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.