Home / 20,712.84-28,569.29-15,660.87

Finding the Fourth Proportional to 20,712.84, 28,569.29 and 15,660.87

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Solution

The fourth proportional to 20,712.84, 28,569.29 and 15,660.87 is: 21,601.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.84 : 28,569.29 = 15,660.87 : x
  2. Step 2: Convert to fraction form
    20,712.84/28,569.29 = 15,660.87/x
  3. Step 3: Cross multiply
    20,712.84x = 28,569.29 × 15,660.87
  4. Step 4: Simplify right side
    20,712.84x = 447,419,858.38
  5. Step 5: Solve for x
    x = 447,419,858.38/20,712.84
  6. Step 6: Final answer
    x = 21,601.09

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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.