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Finding the Fourth Proportional to 139,398.21, 209,023.20 and 55,154.97

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Solution

The fourth proportional to 139,398.21, 209,023.20 and 55,154.97 is: 82,703.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,398.21 : 209,023.20 = 55,154.97 : x
  2. Step 2: Convert to fraction form
    139,398.21/209,023.20 = 55,154.97/x
  3. Step 3: Cross multiply
    139,398.21x = 209,023.20 × 55,154.97
  4. Step 4: Simplify right side
    139,398.21x = 11,528,668,325.30
  5. Step 5: Solve for x
    x = 11,528,668,325.30/139,398.21
  6. Step 6: Final answer
    x = 82,703.13

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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.