Home / 28,221.64-42,295.90-21,145.88

Finding the Fourth Proportional to 28,221.64, 42,295.90 and 21,145.88

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Solution

The fourth proportional to 28,221.64, 42,295.90 and 21,145.88 is: 31,691.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,221.64 : 42,295.90 = 21,145.88 : x
  2. Step 2: Convert to fraction form
    28,221.64/42,295.90 = 21,145.88/x
  3. Step 3: Cross multiply
    28,221.64x = 42,295.90 × 21,145.88
  4. Step 4: Simplify right side
    28,221.64x = 894,384,025.89
  5. Step 5: Solve for x
    x = 894,384,025.89/28,221.64
  6. Step 6: Final answer
    x = 31,691.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.