Home / 20,860.34-28,787.30-11,428.90

Finding the Fourth Proportional to 20,860.34, 28,787.30 and 11,428.90

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Solution

The fourth proportional to 20,860.34, 28,787.30 and 11,428.90 is: 15,771.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.34 : 28,787.30 = 11,428.90 : x
  2. Step 2: Convert to fraction form
    20,860.34/28,787.30 = 11,428.90/x
  3. Step 3: Cross multiply
    20,860.34x = 28,787.30 × 11,428.90
  4. Step 4: Simplify right side
    20,860.34x = 329,007,172.97
  5. Step 5: Solve for x
    x = 329,007,172.97/20,860.34
  6. Step 6: Final answer
    x = 15,771.90

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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.