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Finding the Fourth Proportional to 91,878.20, 137,817.30 and 81,855.80

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Solution

The fourth proportional to 91,878.20, 137,817.30 and 81,855.80 is: 122,783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,878.20 : 137,817.30 = 81,855.80 : x
  2. Step 2: Convert to fraction form
    91,878.20/137,817.30 = 81,855.80/x
  3. Step 3: Cross multiply
    91,878.20x = 137,817.30 × 81,855.80
  4. Step 4: Simplify right side
    91,878.20x = 11,281,145,345.34
  5. Step 5: Solve for x
    x = 11,281,145,345.34/91,878.20
  6. Step 6: Final answer
    x = 122,783.70

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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.