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Finding the Fourth Proportional to 14,978.25, 20,621.40 and 11,785.92

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Solution

The fourth proportional to 14,978.25, 20,621.40 and 11,785.92 is: 16,226.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,978.25 : 20,621.40 = 11,785.92 : x
  2. Step 2: Convert to fraction form
    14,978.25/20,621.40 = 11,785.92/x
  3. Step 3: Cross multiply
    14,978.25x = 20,621.40 × 11,785.92
  4. Step 4: Simplify right side
    14,978.25x = 243,042,170.69
  5. Step 5: Solve for x
    x = 243,042,170.69/14,978.25
  6. Step 6: Final answer
    x = 16,226.34

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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.