Home / 20,860.30-28,787.58-11,428.30

Finding the Fourth Proportional to 20,860.30, 28,787.58 and 11,428.30

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Solution

The fourth proportional to 20,860.30, 28,787.58 and 11,428.30 is: 15,771.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.30 : 28,787.58 = 11,428.30 : x
  2. Step 2: Convert to fraction form
    20,860.30/28,787.58 = 11,428.30/x
  3. Step 3: Cross multiply
    20,860.30x = 28,787.58 × 11,428.30
  4. Step 4: Simplify right side
    20,860.30x = 328,992,899.43
  5. Step 5: Solve for x
    x = 328,992,899.43/20,860.30
  6. Step 6: Final answer
    x = 15,771.25

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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.