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Finding the Fourth Proportional to 128,755.80, 177,682.13 and 71,395.10

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Solution

The fourth proportional to 128,755.80, 177,682.13 and 71,395.10 is: 98,524.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,755.80 : 177,682.13 = 71,395.10 : x
  2. Step 2: Convert to fraction form
    128,755.80/177,682.13 = 71,395.10/x
  3. Step 3: Cross multiply
    128,755.80x = 177,682.13 × 71,395.10
  4. Step 4: Simplify right side
    128,755.80x = 12,685,632,829.28
  5. Step 5: Solve for x
    x = 12,685,632,829.28/128,755.80
  6. Step 6: Final answer
    x = 98,524.75

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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.