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Finding the Fourth Proportional to 91,817.70, 137,532.15 and 81,968.10

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Solution

The fourth proportional to 91,817.70, 137,532.15 and 81,968.10 is: 122,778.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,817.70 : 137,532.15 = 81,968.10 : x
  2. Step 2: Convert to fraction form
    91,817.70/137,532.15 = 81,968.10/x
  3. Step 3: Cross multiply
    91,817.70x = 137,532.15 × 81,968.10
  4. Step 4: Simplify right side
    91,817.70x = 11,273,249,024.42
  5. Step 5: Solve for x
    x = 11,273,249,024.42/91,817.70
  6. Step 6: Final answer
    x = 122,778.60

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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.