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Finding the Fourth Proportional to 139,720.93, 209,564.07 and 39,889.87

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Solution

The fourth proportional to 139,720.93, 209,564.07 and 39,889.87 is: 59,829.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,720.93 : 209,564.07 = 39,889.87 : x
  2. Step 2: Convert to fraction form
    139,720.93/209,564.07 = 39,889.87/x
  3. Step 3: Cross multiply
    139,720.93x = 209,564.07 × 39,889.87
  4. Step 4: Simplify right side
    139,720.93x = 8,359,483,508.97
  5. Step 5: Solve for x
    x = 8,359,483,508.97/139,720.93
  6. Step 6: Final answer
    x = 59,829.86

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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.