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Finding the Fourth Proportional to 138,910.98, 208,378.79 and 39,072

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Solution

The fourth proportional to 138,910.98, 208,378.79 and 39,072 is: 58,611.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,910.98 : 208,378.79 = 39,072 : x
  2. Step 2: Convert to fraction form
    138,910.98/208,378.79 = 39,072/x
  3. Step 3: Cross multiply
    138,910.98x = 208,378.79 × 39,072
  4. Step 4: Simplify right side
    138,910.98x = 8,141,776,082.88
  5. Step 5: Solve for x
    x = 8,141,776,082.88/138,910.98
  6. Step 6: Final answer
    x = 58,611.47

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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.