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Finding the Fourth Proportional to 689.28, 1,031.16 and 472.20

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Solution

The fourth proportional to 689.28, 1,031.16 and 472.20 is: 706.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.28 : 1,031.16 = 472.20 : x
  2. Step 2: Convert to fraction form
    689.28/1,031.16 = 472.20/x
  3. Step 3: Cross multiply
    689.28x = 1,031.16 × 472.20
  4. Step 4: Simplify right side
    689.28x = 486,913.75
  5. Step 5: Solve for x
    x = 486,913.75/689.28
  6. Step 6: Final answer
    x = 706.41

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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.