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Finding the Fourth Proportional to 103,518.60, 155,180.70 and 81,016.80

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Solution

The fourth proportional to 103,518.60, 155,180.70 and 81,016.80 is: 121,449.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,518.60 : 155,180.70 = 81,016.80 : x
  2. Step 2: Convert to fraction form
    103,518.60/155,180.70 = 81,016.80/x
  3. Step 3: Cross multiply
    103,518.60x = 155,180.70 × 81,016.80
  4. Step 4: Simplify right side
    103,518.60x = 12,572,243,735.76
  5. Step 5: Solve for x
    x = 12,572,243,735.76/103,518.60
  6. Step 6: Final answer
    x = 121,449.13

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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.