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Finding the Fourth Proportional to 688.13, 1,031.92 and 219.45

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Solution

The fourth proportional to 688.13, 1,031.92 and 219.45 is: 329.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.13 : 1,031.92 = 219.45 : x
  2. Step 2: Convert to fraction form
    688.13/1,031.92 = 219.45/x
  3. Step 3: Cross multiply
    688.13x = 1,031.92 × 219.45
  4. Step 4: Simplify right side
    688.13x = 226,455.86
  5. Step 5: Solve for x
    x = 226,455.86/688.13
  6. Step 6: Final answer
    x = 329.09

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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.