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Finding the Fourth Proportional to 686.96, 1,031.24 and 551.68

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Solution

The fourth proportional to 686.96, 1,031.24 and 551.68 is: 828.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.96 : 1,031.24 = 551.68 : x
  2. Step 2: Convert to fraction form
    686.96/1,031.24 = 551.68/x
  3. Step 3: Cross multiply
    686.96x = 1,031.24 × 551.68
  4. Step 4: Simplify right side
    686.96x = 568,914.48
  5. Step 5: Solve for x
    x = 568,914.48/686.96
  6. Step 6: Final answer
    x = 828.16

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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.