Home / 20,990.21-28,966.46-11,558.78

Finding the Fourth Proportional to 20,990.21, 28,966.46 and 11,558.78

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Solution

The fourth proportional to 20,990.21, 28,966.46 and 11,558.78 is: 15,951.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.21 : 28,966.46 = 11,558.78 : x
  2. Step 2: Convert to fraction form
    20,990.21/28,966.46 = 11,558.78/x
  3. Step 3: Cross multiply
    20,990.21x = 28,966.46 × 11,558.78
  4. Step 4: Simplify right side
    20,990.21x = 334,816,880.72
  5. Step 5: Solve for x
    x = 334,816,880.72/20,990.21
  6. Step 6: Final answer
    x = 15,951.10

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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.