Home / 20,887.98-28,821.30-12,388.50

Finding the Fourth Proportional to 20,887.98, 28,821.30 and 12,388.50

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Solution

The fourth proportional to 20,887.98, 28,821.30 and 12,388.50 is: 17,093.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,887.98 : 28,821.30 = 12,388.50 : x
  2. Step 2: Convert to fraction form
    20,887.98/28,821.30 = 12,388.50/x
  3. Step 3: Cross multiply
    20,887.98x = 28,821.30 × 12,388.50
  4. Step 4: Simplify right side
    20,887.98x = 357,052,675.05
  5. Step 5: Solve for x
    x = 357,052,675.05/20,887.98
  6. Step 6: Final answer
    x = 17,093.69

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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.