Home / 28,787.28-39,743.64-20,821.20

Finding the Fourth Proportional to 28,787.28, 39,743.64 and 20,821.20

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Solution

The fourth proportional to 28,787.28, 39,743.64 and 20,821.20 is: 28,745.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,787.28 : 39,743.64 = 20,821.20 : x
  2. Step 2: Convert to fraction form
    28,787.28/39,743.64 = 20,821.20/x
  3. Step 3: Cross multiply
    28,787.28x = 39,743.64 × 20,821.20
  4. Step 4: Simplify right side
    28,787.28x = 827,510,277.17
  5. Step 5: Solve for x
    x = 827,510,277.17/28,787.28
  6. Step 6: Final answer
    x = 28,745.69

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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.