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Finding the Fourth Proportional to 122,989.35, 169,726.68 and 71,990.94

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Solution

The fourth proportional to 122,989.35, 169,726.68 and 71,990.94 is: 99,348.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,989.35 : 169,726.68 = 71,990.94 : x
  2. Step 2: Convert to fraction form
    122,989.35/169,726.68 = 71,990.94/x
  3. Step 3: Cross multiply
    122,989.35x = 169,726.68 × 71,990.94
  4. Step 4: Simplify right side
    122,989.35x = 12,218,783,236.28
  5. Step 5: Solve for x
    x = 12,218,783,236.28/122,989.35
  6. Step 6: Final answer
    x = 99,348.30

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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.