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Finding the Fourth Proportional to 688.88, 1,031.64 and 664.04

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Solution

The fourth proportional to 688.88, 1,031.64 and 664.04 is: 994.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.88 : 1,031.64 = 664.04 : x
  2. Step 2: Convert to fraction form
    688.88/1,031.64 = 664.04/x
  3. Step 3: Cross multiply
    688.88x = 1,031.64 × 664.04
  4. Step 4: Simplify right side
    688.88x = 685,050.23
  5. Step 5: Solve for x
    x = 685,050.23/688.88
  6. Step 6: Final answer
    x = 994.44

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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.