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Finding the Fourth Proportional to 70,383.08, 105,584.86 and 21,138.92

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Solution

The fourth proportional to 70,383.08, 105,584.86 and 21,138.92 is: 31,711.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,383.08 : 105,584.86 = 21,138.92 : x
  2. Step 2: Convert to fraction form
    70,383.08/105,584.86 = 21,138.92/x
  3. Step 3: Cross multiply
    70,383.08x = 105,584.86 × 21,138.92
  4. Step 4: Simplify right side
    70,383.08x = 2,231,949,908.75
  5. Step 5: Solve for x
    x = 2,231,949,908.75/70,383.08
  6. Step 6: Final answer
    x = 31,711.46

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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.