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Finding the Fourth Proportional to 128,614.67, 177,489.48 and 71,255.21

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Solution

The fourth proportional to 128,614.67, 177,489.48 and 71,255.21 is: 98,332.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,614.67 : 177,489.48 = 71,255.21 : x
  2. Step 2: Convert to fraction form
    128,614.67/177,489.48 = 71,255.21/x
  3. Step 3: Cross multiply
    128,614.67x = 177,489.48 × 71,255.21
  4. Step 4: Simplify right side
    128,614.67x = 12,647,050,170.19
  5. Step 5: Solve for x
    x = 12,647,050,170.19/128,614.67
  6. Step 6: Final answer
    x = 98,332.87

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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.