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Finding the Fourth Proportional to 38,704.80, 58,116.60 and 21,208.80

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Solution

The fourth proportional to 38,704.80, 58,116.60 and 21,208.80 is: 31,845.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,704.80 : 58,116.60 = 21,208.80 : x
  2. Step 2: Convert to fraction form
    38,704.80/58,116.60 = 21,208.80/x
  3. Step 3: Cross multiply
    38,704.80x = 58,116.60 × 21,208.80
  4. Step 4: Simplify right side
    38,704.80x = 1,232,583,346.08
  5. Step 5: Solve for x
    x = 1,232,583,346.08/38,704.80
  6. Step 6: Final answer
    x = 31,845.75

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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.