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Finding the Fourth Proportional to 128,408.40, 177,316.20 and 80,744.40

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Solution

The fourth proportional to 128,408.40, 177,316.20 and 80,744.40 is: 111,498.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,408.40 : 177,316.20 = 80,744.40 : x
  2. Step 2: Convert to fraction form
    128,408.40/177,316.20 = 80,744.40/x
  3. Step 3: Cross multiply
    128,408.40x = 177,316.20 × 80,744.40
  4. Step 4: Simplify right side
    128,408.40x = 14,317,290,179.28
  5. Step 5: Solve for x
    x = 14,317,290,179.28/128,408.40
  6. Step 6: Final answer
    x = 111,498.08

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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.