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Finding the Fourth Proportional to 120,755.66, 166,639.56 and 72,384.91

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Solution

The fourth proportional to 120,755.66, 166,639.56 and 72,384.91 is: 99,889.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,755.66 : 166,639.56 = 72,384.91 : x
  2. Step 2: Convert to fraction form
    120,755.66/166,639.56 = 72,384.91/x
  3. Step 3: Cross multiply
    120,755.66x = 166,639.56 × 72,384.91
  4. Step 4: Simplify right side
    120,755.66x = 12,062,188,865.00
  5. Step 5: Solve for x
    x = 12,062,188,865.00/120,755.66
  6. Step 6: Final answer
    x = 99,889.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.