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Finding the Fourth Proportional to 70,379.08, 105,568.70 and 21,131.08

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Solution

The fourth proportional to 70,379.08, 105,568.70 and 21,131.08 is: 31,696.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,379.08 : 105,568.70 = 21,131.08 : x
  2. Step 2: Convert to fraction form
    70,379.08/105,568.70 = 21,131.08/x
  3. Step 3: Cross multiply
    70,379.08x = 105,568.70 × 21,131.08
  4. Step 4: Simplify right side
    70,379.08x = 2,230,780,645.20
  5. Step 5: Solve for x
    x = 2,230,780,645.20/70,379.08
  6. Step 6: Final answer
    x = 31,696.64

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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.