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Finding the Fourth Proportional to 123,129.87, 169,906.76 and 90,882.10

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Solution

The fourth proportional to 123,129.87, 169,906.76 and 90,882.10 is: 125,408.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,129.87 : 169,906.76 = 90,882.10 : x
  2. Step 2: Convert to fraction form
    123,129.87/169,906.76 = 90,882.10/x
  3. Step 3: Cross multiply
    123,129.87x = 169,906.76 × 90,882.10
  4. Step 4: Simplify right side
    123,129.87x = 15,441,483,762.99
  5. Step 5: Solve for x
    x = 15,441,483,762.99/123,129.87
  6. Step 6: Final answer
    x = 125,408.10

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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.