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Finding the Fourth Proportional to 139,418.51, 209,140.37 and 39,579.71

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Solution

The fourth proportional to 139,418.51, 209,140.37 and 39,579.71 is: 59,373.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,418.51 : 209,140.37 = 39,579.71 : x
  2. Step 2: Convert to fraction form
    139,418.51/209,140.37 = 39,579.71/x
  3. Step 3: Cross multiply
    139,418.51x = 209,140.37 × 39,579.71
  4. Step 4: Simplify right side
    139,418.51x = 8,277,715,193.89
  5. Step 5: Solve for x
    x = 8,277,715,193.89/139,418.51
  6. Step 6: Final answer
    x = 59,373.14

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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.