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Finding the Fourth Proportional to 72,308.87, 108,437.90 and 21,692.80

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Solution

The fourth proportional to 72,308.87, 108,437.90 and 21,692.80 is: 32,531.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,308.87 : 108,437.90 = 21,692.80 : x
  2. Step 2: Convert to fraction form
    72,308.87/108,437.90 = 21,692.80/x
  3. Step 3: Cross multiply
    72,308.87x = 108,437.90 × 21,692.80
  4. Step 4: Simplify right side
    72,308.87x = 2,352,321,677.12
  5. Step 5: Solve for x
    x = 2,352,321,677.12/72,308.87
  6. Step 6: Final answer
    x = 32,531.58

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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.