Home / 20,990.26-28,968.20-11,560.51

Finding the Fourth Proportional to 20,990.26, 28,968.20 and 11,560.51

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Solution

The fourth proportional to 20,990.26, 28,968.20 and 11,560.51 is: 15,954.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.26 : 28,968.20 = 11,560.51 : x
  2. Step 2: Convert to fraction form
    20,990.26/28,968.20 = 11,560.51/x
  3. Step 3: Cross multiply
    20,990.26x = 28,968.20 × 11,560.51
  4. Step 4: Simplify right side
    20,990.26x = 334,887,165.78
  5. Step 5: Solve for x
    x = 334,887,165.78/20,990.26
  6. Step 6: Final answer
    x = 15,954.41

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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.