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Finding the Fourth Proportional to 128,001.87, 191,979.72 and 34,485.75

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Solution

The fourth proportional to 128,001.87, 191,979.72 and 34,485.75 is: 51,722.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.87 : 191,979.72 = 34,485.75 : x
  2. Step 2: Convert to fraction form
    128,001.87/191,979.72 = 34,485.75/x
  3. Step 3: Cross multiply
    128,001.87x = 191,979.72 × 34,485.75
  4. Step 4: Simplify right side
    128,001.87x = 6,620,564,628.99
  5. Step 5: Solve for x
    x = 6,620,564,628.99/128,001.87
  6. Step 6: Final answer
    x = 51,722.41

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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.