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Finding the Fourth Proportional to 70,245.76, 105,362.88 and 20,997.76

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Solution

The fourth proportional to 70,245.76, 105,362.88 and 20,997.76 is: 31,494.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,245.76 : 105,362.88 = 20,997.76 : x
  2. Step 2: Convert to fraction form
    70,245.76/105,362.88 = 20,997.76/x
  3. Step 3: Cross multiply
    70,245.76x = 105,362.88 × 20,997.76
  4. Step 4: Simplify right side
    70,245.76x = 2,212,384,467.15
  5. Step 5: Solve for x
    x = 2,212,384,467.15/70,245.76
  6. Step 6: Final answer
    x = 31,494.92

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1.5x scale

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.