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Finding the Fourth Proportional to 91,797.20, 137,695.80 and 81,774.80

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Solution

The fourth proportional to 91,797.20, 137,695.80 and 81,774.80 is: 122,662.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,797.20 : 137,695.80 = 81,774.80 : x
  2. Step 2: Convert to fraction form
    91,797.20/137,695.80 = 81,774.80/x
  3. Step 3: Cross multiply
    91,797.20x = 137,695.80 × 81,774.80
  4. Step 4: Simplify right side
    91,797.20x = 11,260,046,505.84
  5. Step 5: Solve for x
    x = 11,260,046,505.84/91,797.20
  6. Step 6: Final answer
    x = 122,662.20

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1.5x scale

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.