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Finding the Fourth Proportional to 128,490.80, 192,754.56 and 39,751.88

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Solution

The fourth proportional to 128,490.80, 192,754.56 and 39,751.88 is: 59,633.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,490.80 : 192,754.56 = 39,751.88 : x
  2. Step 2: Convert to fraction form
    128,490.80/192,754.56 = 39,751.88/x
  3. Step 3: Cross multiply
    128,490.80x = 192,754.56 × 39,751.88
  4. Step 4: Simplify right side
    128,490.80x = 7,662,356,138.57
  5. Step 5: Solve for x
    x = 7,662,356,138.57/128,490.80
  6. Step 6: Final answer
    x = 59,633.50

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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.