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Finding the Fourth Proportional to 128,109.20, 191,904.60 and 88,710.80

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Solution

The fourth proportional to 128,109.20, 191,904.60 and 88,710.80 is: 132,886.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,109.20 : 191,904.60 = 88,710.80 : x
  2. Step 2: Convert to fraction form
    128,109.20/191,904.60 = 88,710.80/x
  3. Step 3: Cross multiply
    128,109.20x = 191,904.60 × 88,710.80
  4. Step 4: Simplify right side
    128,109.20x = 17,024,010,589.68
  5. Step 5: Solve for x
    x = 17,024,010,589.68/128,109.20
  6. Step 6: Final answer
    x = 132,886.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.