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Finding the Fourth Proportional to 100,936.40, 151,185.90 and 83,440.40

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Solution

The fourth proportional to 100,936.40, 151,185.90 and 83,440.40 is: 124,979.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,936.40 : 151,185.90 = 83,440.40 : x
  2. Step 2: Convert to fraction form
    100,936.40/151,185.90 = 83,440.40/x
  3. Step 3: Cross multiply
    100,936.40x = 151,185.90 × 83,440.40
  4. Step 4: Simplify right side
    100,936.40x = 12,615,011,970.36
  5. Step 5: Solve for x
    x = 12,615,011,970.36/100,936.40
  6. Step 6: Final answer
    x = 124,979.81

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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.