Home / 20,972.28-28,941.69-12,588.78

Finding the Fourth Proportional to 20,972.28, 28,941.69 and 12,588.78

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Solution

The fourth proportional to 20,972.28, 28,941.69 and 12,588.78 is: 17,372.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.28 : 28,941.69 = 12,588.78 : x
  2. Step 2: Convert to fraction form
    20,972.28/28,941.69 = 12,588.78/x
  3. Step 3: Cross multiply
    20,972.28x = 28,941.69 × 12,588.78
  4. Step 4: Simplify right side
    20,972.28x = 364,340,568.24
  5. Step 5: Solve for x
    x = 364,340,568.24/20,972.28
  6. Step 6: Final answer
    x = 17,372.48

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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.