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Finding the Fourth Proportional to 139,032.99, 208,521.81 and 82,128.33

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Solution

The fourth proportional to 139,032.99, 208,521.81 and 82,128.33 is: 123,176.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,032.99 : 208,521.81 = 82,128.33 : x
  2. Step 2: Convert to fraction form
    139,032.99/208,521.81 = 82,128.33/x
  3. Step 3: Cross multiply
    139,032.99x = 208,521.81 × 82,128.33
  4. Step 4: Simplify right side
    139,032.99x = 17,125,548,023.88
  5. Step 5: Solve for x
    x = 17,125,548,023.88/139,032.99
  6. Step 6: Final answer
    x = 123,176.15

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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.