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Finding the Fourth Proportional to 687.99, 1,032.09 and 225.76

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Solution

The fourth proportional to 687.99, 1,032.09 and 225.76 is: 338.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.99 : 1,032.09 = 225.76 : x
  2. Step 2: Convert to fraction form
    687.99/1,032.09 = 225.76/x
  3. Step 3: Cross multiply
    687.99x = 1,032.09 × 225.76
  4. Step 4: Simplify right side
    687.99x = 233,004.64
  5. Step 5: Solve for x
    x = 233,004.64/687.99
  6. Step 6: Final answer
    x = 338.67

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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.