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Finding the Fourth Proportional to 128,720.70, 177,634.62 and 78,419.70

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Solution

The fourth proportional to 128,720.70, 177,634.62 and 78,419.70 is: 108,219.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.70 : 177,634.62 = 78,419.70 : x
  2. Step 2: Convert to fraction form
    128,720.70/177,634.62 = 78,419.70/x
  3. Step 3: Cross multiply
    128,720.70x = 177,634.62 × 78,419.70
  4. Step 4: Simplify right side
    128,720.70x = 13,930,053,610.01
  5. Step 5: Solve for x
    x = 13,930,053,610.01/128,720.70
  6. Step 6: Final answer
    x = 108,219.22

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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.