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Finding the Fourth Proportional to 128,671.20, 177,566.26 and 78,370.20

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Solution

The fourth proportional to 128,671.20, 177,566.26 and 78,370.20 is: 108,150.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,671.20 : 177,566.26 = 78,370.20 : x
  2. Step 2: Convert to fraction form
    128,671.20/177,566.26 = 78,370.20/x
  3. Step 3: Cross multiply
    128,671.20x = 177,566.26 × 78,370.20
  4. Step 4: Simplify right side
    128,671.20x = 13,915,903,309.45
  5. Step 5: Solve for x
    x = 13,915,903,309.45/128,671.20
  6. Step 6: Final answer
    x = 108,150.88

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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.