Home / 121,155.60-167,100-78,727.76

Finding the Fourth Proportional to 121,155.60, 167,100 and 78,727.76

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Solution

The fourth proportional to 121,155.60, 167,100 and 78,727.76 is: 108,582.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,155.60 : 167,100 = 78,727.76 : x
  2. Step 2: Convert to fraction form
    121,155.60/167,100 = 78,727.76/x
  3. Step 3: Cross multiply
    121,155.60x = 167,100 × 78,727.76
  4. Step 4: Simplify right side
    121,155.60x = 13,155,408,696
  5. Step 5: Solve for x
    x = 13,155,408,696/121,155.60
  6. Step 6: Final answer
    x = 108,582.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.