Home / 20,921.84-28,885.66-12,972.50

Finding the Fourth Proportional to 20,921.84, 28,885.66 and 12,972.50

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Solution

The fourth proportional to 20,921.84, 28,885.66 and 12,972.50 is: 17,910.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.84 : 28,885.66 = 12,972.50 : x
  2. Step 2: Convert to fraction form
    20,921.84/28,885.66 = 12,972.50/x
  3. Step 3: Cross multiply
    20,921.84x = 28,885.66 × 12,972.50
  4. Step 4: Simplify right side
    20,921.84x = 374,719,224.35
  5. Step 5: Solve for x
    x = 374,719,224.35/20,921.84
  6. Step 6: Final answer
    x = 17,910.43

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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.