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Finding the Fourth Proportional to 688.62, 1,031.76 and 414.66

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Solution

The fourth proportional to 688.62, 1,031.76 and 414.66 is: 621.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.62 : 1,031.76 = 414.66 : x
  2. Step 2: Convert to fraction form
    688.62/1,031.76 = 414.66/x
  3. Step 3: Cross multiply
    688.62x = 1,031.76 × 414.66
  4. Step 4: Simplify right side
    688.62x = 427,829.60
  5. Step 5: Solve for x
    x = 427,829.60/688.62
  6. Step 6: Final answer
    x = 621.29

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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.