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Finding the Fourth Proportional to 687.94, 1,031.91 and 174.94

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Solution

The fourth proportional to 687.94, 1,031.91 and 174.94 is: 262.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.94 : 1,031.91 = 174.94 : x
  2. Step 2: Convert to fraction form
    687.94/1,031.91 = 174.94/x
  3. Step 3: Cross multiply
    687.94x = 1,031.91 × 174.94
  4. Step 4: Simplify right side
    687.94x = 180,522.34
  5. Step 5: Solve for x
    x = 180,522.34/687.94
  6. Step 6: Final answer
    x = 262.41

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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.