Home / 128,628.91-192,962.05-39,889.56

Finding the Fourth Proportional to 128,628.91, 192,962.05 and 39,889.56

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Solution

The fourth proportional to 128,628.91, 192,962.05 and 39,889.56 is: 59,840.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.91 : 192,962.05 = 39,889.56 : x
  2. Step 2: Convert to fraction form
    128,628.91/192,962.05 = 39,889.56/x
  3. Step 3: Cross multiply
    128,628.91x = 192,962.05 × 39,889.56
  4. Step 4: Simplify right side
    128,628.91x = 7,697,171,895.08
  5. Step 5: Solve for x
    x = 7,697,171,895.08/128,628.91
  6. Step 6: Final answer
    x = 59,840.14

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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.