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Finding the Fourth Proportional to 121,685.84, 167,863.56 and 76,999.76

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Solution

The fourth proportional to 121,685.84, 167,863.56 and 76,999.76 is: 106,219.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,685.84 : 167,863.56 = 76,999.76 : x
  2. Step 2: Convert to fraction form
    121,685.84/167,863.56 = 76,999.76/x
  3. Step 3: Cross multiply
    121,685.84x = 167,863.56 × 76,999.76
  4. Step 4: Simplify right side
    121,685.84x = 12,925,453,832.75
  5. Step 5: Solve for x
    x = 12,925,453,832.75/121,685.84
  6. Step 6: Final answer
    x = 106,219.87

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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.