Home / 121,111.60-181,775.40-71,129.20

Finding the Fourth Proportional to 121,111.60, 181,775.40 and 71,129.20

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Solution

The fourth proportional to 121,111.60, 181,775.40 and 71,129.20 is: 106,757.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,111.60 : 181,775.40 = 71,129.20 : x
  2. Step 2: Convert to fraction form
    121,111.60/181,775.40 = 71,129.20/x
  3. Step 3: Cross multiply
    121,111.60x = 181,775.40 × 71,129.20
  4. Step 4: Simplify right side
    121,111.60x = 12,929,538,781.68
  5. Step 5: Solve for x
    x = 12,929,538,781.68/121,111.60
  6. Step 6: Final answer
    x = 106,757.23

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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.