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Finding the Fourth Proportional to 128,029.60, 191,881.20 and 71,869.60

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Solution

The fourth proportional to 128,029.60, 191,881.20 and 71,869.60 is: 107,712.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,029.60 : 191,881.20 = 71,869.60 : x
  2. Step 2: Convert to fraction form
    128,029.60/191,881.20 = 71,869.60/x
  3. Step 3: Cross multiply
    128,029.60x = 191,881.20 × 71,869.60
  4. Step 4: Simplify right side
    128,029.60x = 13,790,425,091.52
  5. Step 5: Solve for x
    x = 13,790,425,091.52/128,029.60
  6. Step 6: Final answer
    x = 107,712.79

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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.