Home / 20,990.90-28,967.81-11,559.44

Finding the Fourth Proportional to 20,990.90, 28,967.81 and 11,559.44

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Solution

The fourth proportional to 20,990.90, 28,967.81 and 11,559.44 is: 15,952.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.90 : 28,967.81 = 11,559.44 : x
  2. Step 2: Convert to fraction form
    20,990.90/28,967.81 = 11,559.44/x
  3. Step 3: Cross multiply
    20,990.90x = 28,967.81 × 11,559.44
  4. Step 4: Simplify right side
    20,990.90x = 334,851,458.99
  5. Step 5: Solve for x
    x = 334,851,458.99/20,990.90
  6. Step 6: Final answer
    x = 15,952.22

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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.