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Finding the Fourth Proportional to 121,118.60, 181,785.90 and 71,136.20

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Solution

The fourth proportional to 121,118.60, 181,785.90 and 71,136.20 is: 106,767.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,118.60 : 181,785.90 = 71,136.20 : x
  2. Step 2: Convert to fraction form
    121,118.60/181,785.90 = 71,136.20/x
  3. Step 3: Cross multiply
    121,118.60x = 181,785.90 × 71,136.20
  4. Step 4: Simplify right side
    121,118.60x = 12,931,558,139.58
  5. Step 5: Solve for x
    x = 12,931,558,139.58/121,118.60
  6. Step 6: Final answer
    x = 106,767.73

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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.