Home / 121,121.60-181,790.40-71,139.20

Finding the Fourth Proportional to 121,121.60, 181,790.40 and 71,139.20

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Solution

The fourth proportional to 121,121.60, 181,790.40 and 71,139.20 is: 106,772.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,121.60 : 181,790.40 = 71,139.20 : x
  2. Step 2: Convert to fraction form
    121,121.60/181,790.40 = 71,139.20/x
  3. Step 3: Cross multiply
    121,121.60x = 181,790.40 × 71,139.20
  4. Step 4: Simplify right side
    121,121.60x = 12,932,423,623.68
  5. Step 5: Solve for x
    x = 12,932,423,623.68/121,121.60
  6. Step 6: Final answer
    x = 106,772.23

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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.