Home / 20,490.10-28,276.58-11,990.37

Finding the Fourth Proportional to 20,490.10, 28,276.58 and 11,990.37

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Solution

The fourth proportional to 20,490.10, 28,276.58 and 11,990.37 is: 16,546.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.10 : 28,276.58 = 11,990.37 : x
  2. Step 2: Convert to fraction form
    20,490.10/28,276.58 = 11,990.37/x
  3. Step 3: Cross multiply
    20,490.10x = 28,276.58 × 11,990.37
  4. Step 4: Simplify right side
    20,490.10x = 339,046,656.53
  5. Step 5: Solve for x
    x = 339,046,656.53/20,490.10
  6. Step 6: Final answer
    x = 16,546.85

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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.