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Finding the Fourth Proportional to 79,780.53, 119,661.48 and 20,611.56

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Solution

The fourth proportional to 79,780.53, 119,661.48 and 20,611.56 is: 30,914.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,780.53 : 119,661.48 = 20,611.56 : x
  2. Step 2: Convert to fraction form
    79,780.53/119,661.48 = 20,611.56/x
  3. Step 3: Cross multiply
    79,780.53x = 119,661.48 × 20,611.56
  4. Step 4: Simplify right side
    79,780.53x = 2,466,409,774.71
  5. Step 5: Solve for x
    x = 2,466,409,774.71/79,780.53
  6. Step 6: Final answer
    x = 30,914.93

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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.