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Finding the Fourth Proportional to 20,940.58, 28,899.84 and 11,510.98

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Solution

The fourth proportional to 20,940.58, 28,899.84 and 11,510.98 is: 15,886.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.58 : 28,899.84 = 11,510.98 : x
  2. Step 2: Convert to fraction form
    20,940.58/28,899.84 = 11,510.98/x
  3. Step 3: Cross multiply
    20,940.58x = 28,899.84 × 11,510.98
  4. Step 4: Simplify right side
    20,940.58x = 332,665,480.24
  5. Step 5: Solve for x
    x = 332,665,480.24/20,940.58
  6. Step 6: Final answer
    x = 15,886.16

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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.