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Finding the Fourth Proportional to 70,608.97, 105,914.32 and 20,690.08

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Solution

The fourth proportional to 70,608.97, 105,914.32 and 20,690.08 is: 31,035.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,608.97 : 105,914.32 = 20,690.08 : x
  2. Step 2: Convert to fraction form
    70,608.97/105,914.32 = 20,690.08/x
  3. Step 3: Cross multiply
    70,608.97x = 105,914.32 × 20,690.08
  4. Step 4: Simplify right side
    70,608.97x = 2,191,376,033.20
  5. Step 5: Solve for x
    x = 2,191,376,033.20/70,608.97
  6. Step 6: Final answer
    x = 31,035.38

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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.