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Finding the Fourth Proportional to 139,712.55, 209,576.42 and 39,865.07

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Solution

The fourth proportional to 139,712.55, 209,576.42 and 39,865.07 is: 59,799.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,712.55 : 209,576.42 = 39,865.07 : x
  2. Step 2: Convert to fraction form
    139,712.55/209,576.42 = 39,865.07/x
  3. Step 3: Cross multiply
    139,712.55x = 209,576.42 × 39,865.07
  4. Step 4: Simplify right side
    139,712.55x = 8,354,777,406.44
  5. Step 5: Solve for x
    x = 8,354,777,406.44/139,712.55
  6. Step 6: Final answer
    x = 59,799.76

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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.