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Finding the Fourth Proportional to 20,679, 28,537.28 and 11,247.57

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Solution

The fourth proportional to 20,679, 28,537.28 and 11,247.57 is: 15,521.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679 : 28,537.28 = 11,247.57 : x
  2. Step 2: Convert to fraction form
    20,679/28,537.28 = 11,247.57/x
  3. Step 3: Cross multiply
    20,679x = 28,537.28 × 11,247.57
  4. Step 4: Simplify right side
    20,679x = 320,974,998.17
  5. Step 5: Solve for x
    x = 320,974,998.17/20,679
  6. Step 6: Final answer
    x = 15,521.79

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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.