Home / 20,939.88-28,885.50-13,269.12

Finding the Fourth Proportional to 20,939.88, 28,885.50 and 13,269.12

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Solution

The fourth proportional to 20,939.88, 28,885.50 and 13,269.12 is: 18,304.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.88 : 28,885.50 = 13,269.12 : x
  2. Step 2: Convert to fraction form
    20,939.88/28,885.50 = 13,269.12/x
  3. Step 3: Cross multiply
    20,939.88x = 28,885.50 × 13,269.12
  4. Step 4: Simplify right side
    20,939.88x = 383,285,165.76
  5. Step 5: Solve for x
    x = 383,285,165.76/20,939.88
  6. Step 6: Final answer
    x = 18,304.08

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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.