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Finding the Fourth Proportional to 71,670.94, 98,905.15 and 39,839.15

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Solution

The fourth proportional to 71,670.94, 98,905.15 and 39,839.15 is: 54,977.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,670.94 : 98,905.15 = 39,839.15 : x
  2. Step 2: Convert to fraction form
    71,670.94/98,905.15 = 39,839.15/x
  3. Step 3: Cross multiply
    71,670.94x = 98,905.15 × 39,839.15
  4. Step 4: Simplify right side
    71,670.94x = 3,940,297,106.62
  5. Step 5: Solve for x
    x = 3,940,297,106.62/71,670.94
  6. Step 6: Final answer
    x = 54,977.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.