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Finding the Fourth Proportional to 139,628.40, 209,442.60 and 73,042.80

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Solution

The fourth proportional to 139,628.40, 209,442.60 and 73,042.80 is: 109,564.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,628.40 : 209,442.60 = 73,042.80 : x
  2. Step 2: Convert to fraction form
    139,628.40/209,442.60 = 73,042.80/x
  3. Step 3: Cross multiply
    139,628.40x = 209,442.60 × 73,042.80
  4. Step 4: Simplify right side
    139,628.40x = 15,298,273,943.28
  5. Step 5: Solve for x
    x = 15,298,273,943.28/139,628.40
  6. Step 6: Final answer
    x = 109,564.20

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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.