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Finding the Fourth Proportional to 35,309.75, 48,731.78 and 20,405.75

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Solution

The fourth proportional to 35,309.75, 48,731.78 and 20,405.75 is: 28,162.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,309.75 : 48,731.78 = 20,405.75 : x
  2. Step 2: Convert to fraction form
    35,309.75/48,731.78 = 20,405.75/x
  3. Step 3: Cross multiply
    35,309.75x = 48,731.78 × 20,405.75
  4. Step 4: Simplify right side
    35,309.75x = 994,408,519.74
  5. Step 5: Solve for x
    x = 994,408,519.74/35,309.75
  6. Step 6: Final answer
    x = 28,162.43

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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.