Home / 2,689.84-3,712.38-2,121.37

Finding the Fourth Proportional to 2,689.84, 3,712.38 and 2,121.37

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Solution

The fourth proportional to 2,689.84, 3,712.38 and 2,121.37 is: 2,927.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.84 : 3,712.38 = 2,121.37 : x
  2. Step 2: Convert to fraction form
    2,689.84/3,712.38 = 2,121.37/x
  3. Step 3: Cross multiply
    2,689.84x = 3,712.38 × 2,121.37
  4. Step 4: Simplify right side
    2,689.84x = 7,875,347.14
  5. Step 5: Solve for x
    x = 7,875,347.14/2,689.84
  6. Step 6: Final answer
    x = 2,927.81

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1.5x scale

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.