Home / 2,712.80-4,069.68-981.28

Finding the Fourth Proportional to 2,712.80, 4,069.68 and 981.28

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Solution

The fourth proportional to 2,712.80, 4,069.68 and 981.28 is: 1,472.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.80 : 4,069.68 = 981.28 : x
  2. Step 2: Convert to fraction form
    2,712.80/4,069.68 = 981.28/x
  3. Step 3: Cross multiply
    2,712.80x = 4,069.68 × 981.28
  4. Step 4: Simplify right side
    2,712.80x = 3,993,495.59
  5. Step 5: Solve for x
    x = 3,993,495.59/2,712.80
  6. Step 6: Final answer
    x = 1,472.09

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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.