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Finding the Fourth Proportional to 688.72, 1,031.37 and 482.32

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Solution

The fourth proportional to 688.72, 1,031.37 and 482.32 is: 722.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.72 : 1,031.37 = 482.32 : x
  2. Step 2: Convert to fraction form
    688.72/1,031.37 = 482.32/x
  3. Step 3: Cross multiply
    688.72x = 1,031.37 × 482.32
  4. Step 4: Simplify right side
    688.72x = 497,450.38
  5. Step 5: Solve for x
    x = 497,450.38/688.72
  6. Step 6: Final answer
    x = 722.28

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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.