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Finding the Fourth Proportional to 128,665.30, 193,012.17 and 44,415.91

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Solution

The fourth proportional to 128,665.30, 193,012.17 and 44,415.91 is: 66,628.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,665.30 : 193,012.17 = 44,415.91 : x
  2. Step 2: Convert to fraction form
    128,665.30/193,012.17 = 44,415.91/x
  3. Step 3: Cross multiply
    128,665.30x = 193,012.17 × 44,415.91
  4. Step 4: Simplify right side
    128,665.30x = 8,572,811,171.62
  5. Step 5: Solve for x
    x = 8,572,811,171.62/128,665.30
  6. Step 6: Final answer
    x = 66,628.77

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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.