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Finding the Fourth Proportional to 1,008.91, 1,518.97 and 922.81

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Solution

The fourth proportional to 1,008.91, 1,518.97 and 922.81 is: 1,389.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.91 : 1,518.97 = 922.81 : x
  2. Step 2: Convert to fraction form
    1,008.91/1,518.97 = 922.81/x
  3. Step 3: Cross multiply
    1,008.91x = 1,518.97 × 922.81
  4. Step 4: Simplify right side
    1,008.91x = 1,401,716.09
  5. Step 5: Solve for x
    x = 1,401,716.09/1,008.91
  6. Step 6: Final answer
    x = 1,389.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.