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Finding the Fourth Proportional to 54,679.80, 82,116.90 and 39,905.40

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Solution

The fourth proportional to 54,679.80, 82,116.90 and 39,905.40 is: 59,929.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,679.80 : 82,116.90 = 39,905.40 : x
  2. Step 2: Convert to fraction form
    54,679.80/82,116.90 = 39,905.40/x
  3. Step 3: Cross multiply
    54,679.80x = 82,116.90 × 39,905.40
  4. Step 4: Simplify right side
    54,679.80x = 3,276,907,741.26
  5. Step 5: Solve for x
    x = 3,276,907,741.26/54,679.80
  6. Step 6: Final answer
    x = 59,929.04

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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.