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Finding the Fourth Proportional to 128,465.60, 192,727.20 and 39,723.20

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Solution

The fourth proportional to 128,465.60, 192,727.20 and 39,723.20 is: 59,593.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,465.60 : 192,727.20 = 39,723.20 : x
  2. Step 2: Convert to fraction form
    128,465.60/192,727.20 = 39,723.20/x
  3. Step 3: Cross multiply
    128,465.60x = 192,727.20 × 39,723.20
  4. Step 4: Simplify right side
    128,465.60x = 7,655,741,111.04
  5. Step 5: Solve for x
    x = 7,655,741,111.04/128,465.60
  6. Step 6: Final answer
    x = 59,593.71

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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.