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Finding the Fourth Proportional to 689.18, 1,031.42 and 587.66

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Solution

The fourth proportional to 689.18, 1,031.42 and 587.66 is: 879.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.18 : 1,031.42 = 587.66 : x
  2. Step 2: Convert to fraction form
    689.18/1,031.42 = 587.66/x
  3. Step 3: Cross multiply
    689.18x = 1,031.42 × 587.66
  4. Step 4: Simplify right side
    689.18x = 606,124.28
  5. Step 5: Solve for x
    x = 606,124.28/689.18
  6. Step 6: Final answer
    x = 879.49

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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.