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Finding the Fourth Proportional to 103,761.60, 155,545.20 and 81,259.80

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Solution

The fourth proportional to 103,761.60, 155,545.20 and 81,259.80 is: 121,813.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,761.60 : 155,545.20 = 81,259.80 : x
  2. Step 2: Convert to fraction form
    103,761.60/155,545.20 = 81,259.80/x
  3. Step 3: Cross multiply
    103,761.60x = 155,545.20 × 81,259.80
  4. Step 4: Simplify right side
    103,761.60x = 12,639,571,842.96
  5. Step 5: Solve for x
    x = 12,639,571,842.96/103,761.60
  6. Step 6: Final answer
    x = 121,813.58

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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.