Home / 21,005.58-28,982.70-11,928.95

Finding the Fourth Proportional to 21,005.58, 28,982.70 and 11,928.95

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Solution

The fourth proportional to 21,005.58, 28,982.70 and 11,928.95 is: 16,459.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.58 : 28,982.70 = 11,928.95 : x
  2. Step 2: Convert to fraction form
    21,005.58/28,982.70 = 11,928.95/x
  3. Step 3: Cross multiply
    21,005.58x = 28,982.70 × 11,928.95
  4. Step 4: Simplify right side
    21,005.58x = 345,733,034.25
  5. Step 5: Solve for x
    x = 345,733,034.25/21,005.58
  6. Step 6: Final answer
    x = 16,459.10

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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.