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Finding the Fourth Proportional to 128,949.72, 177,958.67 and 74,504.22

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Solution

The fourth proportional to 128,949.72, 177,958.67 and 74,504.22 is: 102,820.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,949.72 : 177,958.67 = 74,504.22 : x
  2. Step 2: Convert to fraction form
    128,949.72/177,958.67 = 74,504.22/x
  3. Step 3: Cross multiply
    128,949.72x = 177,958.67 × 74,504.22
  4. Step 4: Simplify right side
    128,949.72x = 13,258,671,528.07
  5. Step 5: Solve for x
    x = 13,258,671,528.07/128,949.72
  6. Step 6: Final answer
    x = 102,820.48

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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.