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Finding the Fourth Proportional to 688.62, 1,031.48 and 541.68

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Solution

The fourth proportional to 688.62, 1,031.48 and 541.68 is: 811.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.62 : 1,031.48 = 541.68 : x
  2. Step 2: Convert to fraction form
    688.62/1,031.48 = 541.68/x
  3. Step 3: Cross multiply
    688.62x = 1,031.48 × 541.68
  4. Step 4: Simplify right side
    688.62x = 558,732.09
  5. Step 5: Solve for x
    x = 558,732.09/688.62
  6. Step 6: Final answer
    x = 811.38

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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.