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Finding the Fourth Proportional to 128,065.87, 191,943.24 and 90,636.88

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Solution

The fourth proportional to 128,065.87, 191,943.24 and 90,636.88 is: 135,845.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,065.87 : 191,943.24 = 90,636.88 : x
  2. Step 2: Convert to fraction form
    128,065.87/191,943.24 = 90,636.88/x
  3. Step 3: Cross multiply
    128,065.87x = 191,943.24 × 90,636.88
  4. Step 4: Simplify right side
    128,065.87x = 17,397,136,410.69
  5. Step 5: Solve for x
    x = 17,397,136,410.69/128,065.87
  6. Step 6: Final answer
    x = 135,845.22

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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.