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Finding the Fourth Proportional to 689.11, 1,031.36 and 632.21

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Solution

The fourth proportional to 689.11, 1,031.36 and 632.21 is: 946.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.11 : 1,031.36 = 632.21 : x
  2. Step 2: Convert to fraction form
    689.11/1,031.36 = 632.21/x
  3. Step 3: Cross multiply
    689.11x = 1,031.36 × 632.21
  4. Step 4: Simplify right side
    689.11x = 652,031.66
  5. Step 5: Solve for x
    x = 652,031.66/689.11
  6. Step 6: Final answer
    x = 946.19

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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.