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Finding the Fourth Proportional to 91,795.20, 137,692.80 and 81,350.40

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Solution

The fourth proportional to 91,795.20, 137,692.80 and 81,350.40 is: 122,025.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,795.20 : 137,692.80 = 81,350.40 : x
  2. Step 2: Convert to fraction form
    91,795.20/137,692.80 = 81,350.40/x
  3. Step 3: Cross multiply
    91,795.20x = 137,692.80 × 81,350.40
  4. Step 4: Simplify right side
    91,795.20x = 11,201,364,357.12
  5. Step 5: Solve for x
    x = 11,201,364,357.12/91,795.20
  6. Step 6: Final answer
    x = 122,025.60

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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.