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Finding the Fourth Proportional to 128,449.67, 177,256.90 and 71,091.40

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Solution

The fourth proportional to 128,449.67, 177,256.90 and 71,091.40 is: 98,104.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,449.67 : 177,256.90 = 71,091.40 : x
  2. Step 2: Convert to fraction form
    128,449.67/177,256.90 = 71,091.40/x
  3. Step 3: Cross multiply
    128,449.67x = 177,256.90 × 71,091.40
  4. Step 4: Simplify right side
    128,449.67x = 12,601,439,938.92
  5. Step 5: Solve for x
    x = 12,601,439,938.92/128,449.67
  6. Step 6: Final answer
    x = 98,104.11

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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.