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Finding the Fourth Proportional to 138,995.91, 208,506.11 and 39,156.93

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Solution

The fourth proportional to 138,995.91, 208,506.11 and 39,156.93 is: 58,738.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,995.91 : 208,506.11 = 39,156.93 : x
  2. Step 2: Convert to fraction form
    138,995.91/208,506.11 = 39,156.93/x
  3. Step 3: Cross multiply
    138,995.91x = 208,506.11 × 39,156.93
  4. Step 4: Simplify right side
    138,995.91x = 8,164,458,958.06
  5. Step 5: Solve for x
    x = 8,164,458,958.06/138,995.91
  6. Step 6: Final answer
    x = 58,738.84

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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.