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Finding the Fourth Proportional to 117,230.49, 161,688.81 and 100,905.48

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Solution

The fourth proportional to 117,230.49, 161,688.81 and 100,905.48 is: 139,172.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,230.49 : 161,688.81 = 100,905.48 : x
  2. Step 2: Convert to fraction form
    117,230.49/161,688.81 = 100,905.48/x
  3. Step 3: Cross multiply
    117,230.49x = 161,688.81 × 100,905.48
  4. Step 4: Simplify right side
    117,230.49x = 16,315,286,983.68
  5. Step 5: Solve for x
    x = 16,315,286,983.68/117,230.49
  6. Step 6: Final answer
    x = 139,172.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.