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Finding the Fourth Proportional to 139,638.06, 209,425.53 and 39,796.11

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Solution

The fourth proportional to 139,638.06, 209,425.53 and 39,796.11 is: 59,685.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,638.06 : 209,425.53 = 39,796.11 : x
  2. Step 2: Convert to fraction form
    139,638.06/209,425.53 = 39,796.11/x
  3. Step 3: Cross multiply
    139,638.06x = 209,425.53 × 39,796.11
  4. Step 4: Simplify right side
    139,638.06x = 8,334,321,428.69
  5. Step 5: Solve for x
    x = 8,334,321,428.69/139,638.06
  6. Step 6: Final answer
    x = 59,685.17

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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.