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Finding the Fourth Proportional to 139,707.36, 209,602.44 and 80,585.46

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Solution

The fourth proportional to 139,707.36, 209,602.44 and 80,585.46 is: 120,902.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,707.36 : 209,602.44 = 80,585.46 : x
  2. Step 2: Convert to fraction form
    139,707.36/209,602.44 = 80,585.46/x
  3. Step 3: Cross multiply
    139,707.36x = 209,602.44 × 80,585.46
  4. Step 4: Simplify right side
    139,707.36x = 16,890,909,044.52
  5. Step 5: Solve for x
    x = 16,890,909,044.52/139,707.36
  6. Step 6: Final answer
    x = 120,902.07

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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.