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Finding the Fourth Proportional to 35,502.72, 48,990.88 and 20,390.56

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Solution

The fourth proportional to 35,502.72, 48,990.88 and 20,390.56 is: 28,137.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,502.72 : 48,990.88 = 20,390.56 : x
  2. Step 2: Convert to fraction form
    35,502.72/48,990.88 = 20,390.56/x
  3. Step 3: Cross multiply
    35,502.72x = 48,990.88 × 20,390.56
  4. Step 4: Simplify right side
    35,502.72x = 998,951,478.09
  5. Step 5: Solve for x
    x = 998,951,478.09/35,502.72
  6. Step 6: Final answer
    x = 28,137.32

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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.