Home / 121,665.28-167,886.78-78,645.77

Finding the Fourth Proportional to 121,665.28, 167,886.78 and 78,645.77

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Solution

The fourth proportional to 121,665.28, 167,886.78 and 78,645.77 is: 108,523.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,665.28 : 167,886.78 = 78,645.77 : x
  2. Step 2: Convert to fraction form
    121,665.28/167,886.78 = 78,645.77/x
  3. Step 3: Cross multiply
    121,665.28x = 167,886.78 × 78,645.77
  4. Step 4: Simplify right side
    121,665.28x = 13,203,585,085.92
  5. Step 5: Solve for x
    x = 13,203,585,085.92/121,665.28
  6. Step 6: Final answer
    x = 108,523.85

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1.5x scale

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.