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Finding the Fourth Proportional to 128,995.16, 193,485.90 and 40,238.49

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Solution

The fourth proportional to 128,995.16, 193,485.90 and 40,238.49 is: 60,355.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,995.16 : 193,485.90 = 40,238.49 : x
  2. Step 2: Convert to fraction form
    128,995.16/193,485.90 = 40,238.49/x
  3. Step 3: Cross multiply
    128,995.16x = 193,485.90 × 40,238.49
  4. Step 4: Simplify right side
    128,995.16x = 7,785,581,102.42
  5. Step 5: Solve for x
    x = 7,785,581,102.42/128,995.16
  6. Step 6: Final answer
    x = 60,355.61

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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.