Home / 20,990.87-28,967.60-11,559.50

Finding the Fourth Proportional to 20,990.87, 28,967.60 and 11,559.50

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Solution

The fourth proportional to 20,990.87, 28,967.60 and 11,559.50 is: 15,952.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.87 : 28,967.60 = 11,559.50 : x
  2. Step 2: Convert to fraction form
    20,990.87/28,967.60 = 11,559.50/x
  3. Step 3: Cross multiply
    20,990.87x = 28,967.60 × 11,559.50
  4. Step 4: Simplify right side
    20,990.87x = 334,850,914.40
  5. Step 5: Solve for x
    x = 334,850,914.40/20,990.87
  6. Step 6: Final answer
    x = 15,952.22

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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.