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Finding the Fourth Proportional to 144,388.80, 216,842.40 and 139,723.20

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Solution

The fourth proportional to 144,388.80, 216,842.40 and 139,723.20 is: 209,835.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,388.80 : 216,842.40 = 139,723.20 : x
  2. Step 2: Convert to fraction form
    144,388.80/216,842.40 = 139,723.20/x
  3. Step 3: Cross multiply
    144,388.80x = 216,842.40 × 139,723.20
  4. Step 4: Simplify right side
    144,388.80x = 30,297,914,023.68
  5. Step 5: Solve for x
    x = 30,297,914,023.68/144,388.80
  6. Step 6: Final answer
    x = 209,835.62

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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.