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Finding the Fourth Proportional to 128,374.61, 192,550.97 and 39,628.78

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Solution

The fourth proportional to 128,374.61, 192,550.97 and 39,628.78 is: 59,439.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,374.61 : 192,550.97 = 39,628.78 : x
  2. Step 2: Convert to fraction form
    128,374.61/192,550.97 = 39,628.78/x
  3. Step 3: Cross multiply
    128,374.61x = 192,550.97 × 39,628.78
  4. Step 4: Simplify right side
    128,374.61x = 7,630,559,646.61
  5. Step 5: Solve for x
    x = 7,630,559,646.61/128,374.61
  6. Step 6: Final answer
    x = 59,439.79

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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.