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Finding the Fourth Proportional to 1,617.30, 2,231.81 and 988.89

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Solution

The fourth proportional to 1,617.30, 2,231.81 and 988.89 is: 1,364.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.30 : 2,231.81 = 988.89 : x
  2. Step 2: Convert to fraction form
    1,617.30/2,231.81 = 988.89/x
  3. Step 3: Cross multiply
    1,617.30x = 2,231.81 × 988.89
  4. Step 4: Simplify right side
    1,617.30x = 2,207,004.99
  5. Step 5: Solve for x
    x = 2,207,004.99/1,617.30
  6. Step 6: Final answer
    x = 1,364.62

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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.