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Finding the Fourth Proportional to 81,658.05, 122,485.95 and 39,541.89

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Solution

The fourth proportional to 81,658.05, 122,485.95 and 39,541.89 is: 59,312.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,658.05 : 122,485.95 = 39,541.89 : x
  2. Step 2: Convert to fraction form
    81,658.05/122,485.95 = 39,541.89/x
  3. Step 3: Cross multiply
    81,658.05x = 122,485.95 × 39,541.89
  4. Step 4: Simplify right side
    81,658.05x = 4,843,325,961.45
  5. Step 5: Solve for x
    x = 4,843,325,961.45/81,658.05
  6. Step 6: Final answer
    x = 59,312.29

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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.