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Finding the Fourth Proportional to 128,906.13, 177,847.74 and 77,934.45

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Solution

The fourth proportional to 128,906.13, 177,847.74 and 77,934.45 is: 107,523.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,906.13 : 177,847.74 = 77,934.45 : x
  2. Step 2: Convert to fraction form
    128,906.13/177,847.74 = 77,934.45/x
  3. Step 3: Cross multiply
    128,906.13x = 177,847.74 × 77,934.45
  4. Step 4: Simplify right side
    128,906.13x = 13,860,465,800.64
  5. Step 5: Solve for x
    x = 13,860,465,800.64/128,906.13
  6. Step 6: Final answer
    x = 107,523.71

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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.