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Finding the Fourth Proportional to 121,137.79, 180,463.57 and 115,672.88

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Solution

The fourth proportional to 121,137.79, 180,463.57 and 115,672.88 is: 172,322.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,137.79 : 180,463.57 = 115,672.88 : x
  2. Step 2: Convert to fraction form
    121,137.79/180,463.57 = 115,672.88/x
  3. Step 3: Cross multiply
    121,137.79x = 180,463.57 × 115,672.88
  4. Step 4: Simplify right side
    121,137.79x = 20,874,741,201.62
  5. Step 5: Solve for x
    x = 20,874,741,201.62/121,137.79
  6. Step 6: Final answer
    x = 172,322.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.