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Finding the Fourth Proportional to 104,859.70, 156,943.95 and 81,358.90

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Solution

The fourth proportional to 104,859.70, 156,943.95 and 81,358.90 is: 121,770.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,859.70 : 156,943.95 = 81,358.90 : x
  2. Step 2: Convert to fraction form
    104,859.70/156,943.95 = 81,358.90/x
  3. Step 3: Cross multiply
    104,859.70x = 156,943.95 × 81,358.90
  4. Step 4: Simplify right side
    104,859.70x = 12,768,787,133.66
  5. Step 5: Solve for x
    x = 12,768,787,133.66/104,859.70
  6. Step 6: Final answer
    x = 121,770.20

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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.