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Finding the Fourth Proportional to 128,820.84, 177,782.21 and 71,469.19

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Solution

The fourth proportional to 128,820.84, 177,782.21 and 71,469.19 is: 98,632.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,820.84 : 177,782.21 = 71,469.19 : x
  2. Step 2: Convert to fraction form
    128,820.84/177,782.21 = 71,469.19/x
  3. Step 3: Cross multiply
    128,820.84x = 177,782.21 × 71,469.19
  4. Step 4: Simplify right side
    128,820.84x = 12,705,950,545.11
  5. Step 5: Solve for x
    x = 12,705,950,545.11/128,820.84
  6. Step 6: Final answer
    x = 98,632.73

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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.