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Finding the Fourth Proportional to 128,591.77, 192,703.85 and 72,313.75

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Solution

The fourth proportional to 128,591.77, 192,703.85 and 72,313.75 is: 108,367.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,591.77 : 192,703.85 = 72,313.75 : x
  2. Step 2: Convert to fraction form
    128,591.77/192,703.85 = 72,313.75/x
  3. Step 3: Cross multiply
    128,591.77x = 192,703.85 × 72,313.75
  4. Step 4: Simplify right side
    128,591.77x = 13,935,138,032.94
  5. Step 5: Solve for x
    x = 13,935,138,032.94/128,591.77
  6. Step 6: Final answer
    x = 108,367.26

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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.