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Finding the Fourth Proportional to 70,329.75, 105,494.63 and 21,081.75

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Solution

The fourth proportional to 70,329.75, 105,494.63 and 21,081.75 is: 31,622.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,329.75 : 105,494.63 = 21,081.75 : x
  2. Step 2: Convert to fraction form
    70,329.75/105,494.63 = 21,081.75/x
  3. Step 3: Cross multiply
    70,329.75x = 105,494.63 × 21,081.75
  4. Step 4: Simplify right side
    70,329.75x = 2,224,011,310.59
  5. Step 5: Solve for x
    x = 2,224,011,310.59/70,329.75
  6. Step 6: Final answer
    x = 31,622.63

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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.