Home / 20,986.72-28,955.14-11,910.58

Finding the Fourth Proportional to 20,986.72, 28,955.14 and 11,910.58

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Solution

The fourth proportional to 20,986.72, 28,955.14 and 11,910.58 is: 16,432.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.72 : 28,955.14 = 11,910.58 : x
  2. Step 2: Convert to fraction form
    20,986.72/28,955.14 = 11,910.58/x
  3. Step 3: Cross multiply
    20,986.72x = 28,955.14 × 11,910.58
  4. Step 4: Simplify right side
    20,986.72x = 344,872,511.38
  5. Step 5: Solve for x
    x = 344,872,511.38/20,986.72
  6. Step 6: Final answer
    x = 16,432.89

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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.