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Finding the Fourth Proportional to 688.26, 1,031.70 and 670.49

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Solution

The fourth proportional to 688.26, 1,031.70 and 670.49 is: 1,005.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.26 : 1,031.70 = 670.49 : x
  2. Step 2: Convert to fraction form
    688.26/1,031.70 = 670.49/x
  3. Step 3: Cross multiply
    688.26x = 1,031.70 × 670.49
  4. Step 4: Simplify right side
    688.26x = 691,745.76
  5. Step 5: Solve for x
    x = 691,745.76/688.26
  6. Step 6: Final answer
    x = 1,005.06

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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.