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Finding the Fourth Proportional to 70,628.79, 105,944.06 and 20,709.88

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Solution

The fourth proportional to 70,628.79, 105,944.06 and 20,709.88 is: 31,065.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,628.79 : 105,944.06 = 20,709.88 : x
  2. Step 2: Convert to fraction form
    70,628.79/105,944.06 = 20,709.88/x
  3. Step 3: Cross multiply
    70,628.79x = 105,944.06 × 20,709.88
  4. Step 4: Simplify right side
    70,628.79x = 2,194,088,556.23
  5. Step 5: Solve for x
    x = 2,194,088,556.23/70,628.79
  6. Step 6: Final answer
    x = 31,065.07

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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.