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Finding the Fourth Proportional to 81,915.90, 122,921.63 and 34,528.11

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Solution

The fourth proportional to 81,915.90, 122,921.63 and 34,528.11 is: 51,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,915.90 : 122,921.63 = 34,528.11 : x
  2. Step 2: Convert to fraction form
    81,915.90/122,921.63 = 34,528.11/x
  3. Step 3: Cross multiply
    81,915.90x = 122,921.63 × 34,528.11
  4. Step 4: Simplify right side
    81,915.90x = 4,244,251,389.38
  5. Step 5: Solve for x
    x = 4,244,251,389.38/81,915.90
  6. Step 6: Final answer
    x = 51,812.30

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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.