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Finding the Fourth Proportional to 128,939.62, 193,409.16 and 72,754.24

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Solution

The fourth proportional to 128,939.62, 193,409.16 and 72,754.24 is: 109,131.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,939.62 : 193,409.16 = 72,754.24 : x
  2. Step 2: Convert to fraction form
    128,939.62/193,409.16 = 72,754.24/x
  3. Step 3: Cross multiply
    128,939.62x = 193,409.16 × 72,754.24
  4. Step 4: Simplify right side
    128,939.62x = 14,071,336,444.84
  5. Step 5: Solve for x
    x = 14,071,336,444.84/128,939.62
  6. Step 6: Final answer
    x = 109,131.21

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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.