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Finding the Fourth Proportional to 688.64, 1,031.12 and 579.29

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Solution

The fourth proportional to 688.64, 1,031.12 and 579.29 is: 867.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.64 : 1,031.12 = 579.29 : x
  2. Step 2: Convert to fraction form
    688.64/1,031.12 = 579.29/x
  3. Step 3: Cross multiply
    688.64x = 1,031.12 × 579.29
  4. Step 4: Simplify right side
    688.64x = 597,317.50
  5. Step 5: Solve for x
    x = 597,317.50/688.64
  6. Step 6: Final answer
    x = 867.39

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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.