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Finding the Fourth Proportional to 103,893.30, 155,660.90 and 81,143.04

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Solution

The fourth proportional to 103,893.30, 155,660.90 and 81,143.04 is: 121,574.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,893.30 : 155,660.90 = 81,143.04 : x
  2. Step 2: Convert to fraction form
    103,893.30/155,660.90 = 81,143.04/x
  3. Step 3: Cross multiply
    103,893.30x = 155,660.90 × 81,143.04
  4. Step 4: Simplify right side
    103,893.30x = 12,630,798,635.14
  5. Step 5: Solve for x
    x = 12,630,798,635.14/103,893.30
  6. Step 6: Final answer
    x = 121,574.72

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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.