Home / 21,780.28-30,056.39-12,220.34

Finding the Fourth Proportional to 21,780.28, 30,056.39 and 12,220.34

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Solution

The fourth proportional to 21,780.28, 30,056.39 and 12,220.34 is: 16,863.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,780.28 : 30,056.39 = 12,220.34 : x
  2. Step 2: Convert to fraction form
    21,780.28/30,056.39 = 12,220.34/x
  3. Step 3: Cross multiply
    21,780.28x = 30,056.39 × 12,220.34
  4. Step 4: Simplify right side
    21,780.28x = 367,299,243.87
  5. Step 5: Solve for x
    x = 367,299,243.87/21,780.28
  6. Step 6: Final answer
    x = 16,863.85

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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.