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Finding the Fourth Proportional to 109,385.80, 164,078.70 and 81,737.80

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Solution

The fourth proportional to 109,385.80, 164,078.70 and 81,737.80 is: 122,606.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,385.80 : 164,078.70 = 81,737.80 : x
  2. Step 2: Convert to fraction form
    109,385.80/164,078.70 = 81,737.80/x
  3. Step 3: Cross multiply
    109,385.80x = 164,078.70 × 81,737.80
  4. Step 4: Simplify right side
    109,385.80x = 13,411,431,964.86
  5. Step 5: Solve for x
    x = 13,411,431,964.86/109,385.80
  6. Step 6: Final answer
    x = 122,606.70

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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.