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Finding the Fourth Proportional to 70,415.73, 105,640.92 and 20,496.29

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Solution

The fourth proportional to 70,415.73, 105,640.92 and 20,496.29 is: 30,749.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,415.73 : 105,640.92 = 20,496.29 : x
  2. Step 2: Convert to fraction form
    70,415.73/105,640.92 = 20,496.29/x
  3. Step 3: Cross multiply
    70,415.73x = 105,640.92 × 20,496.29
  4. Step 4: Simplify right side
    70,415.73x = 2,165,246,403.98
  5. Step 5: Solve for x
    x = 2,165,246,403.98/70,415.73
  6. Step 6: Final answer
    x = 30,749.47

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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.