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Finding the Fourth Proportional to 104,861.70, 156,946.95 and 81,360.90

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Solution

The fourth proportional to 104,861.70, 156,946.95 and 81,360.90 is: 121,773.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,861.70 : 156,946.95 = 81,360.90 : x
  2. Step 2: Convert to fraction form
    104,861.70/156,946.95 = 81,360.90/x
  3. Step 3: Cross multiply
    104,861.70x = 156,946.95 × 81,360.90
  4. Step 4: Simplify right side
    104,861.70x = 12,769,345,104.26
  5. Step 5: Solve for x
    x = 12,769,345,104.26/104,861.70
  6. Step 6: Final answer
    x = 121,773.20

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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.