Home / 121,136.40-181,704.60-76,813.20

Finding the Fourth Proportional to 121,136.40, 181,704.60 and 76,813.20

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Solution

The fourth proportional to 121,136.40, 181,704.60 and 76,813.20 is: 115,219.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,136.40 : 181,704.60 = 76,813.20 : x
  2. Step 2: Convert to fraction form
    121,136.40/181,704.60 = 76,813.20/x
  3. Step 3: Cross multiply
    121,136.40x = 181,704.60 × 76,813.20
  4. Step 4: Simplify right side
    121,136.40x = 13,957,311,780.72
  5. Step 5: Solve for x
    x = 13,957,311,780.72/121,136.40
  6. Step 6: Final answer
    x = 115,219.80

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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.