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Finding the Fourth Proportional to 689.58, 1,035.11 and 663.32

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Solution

The fourth proportional to 689.58, 1,035.11 and 663.32 is: 995.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.58 : 1,035.11 = 663.32 : x
  2. Step 2: Convert to fraction form
    689.58/1,035.11 = 663.32/x
  3. Step 3: Cross multiply
    689.58x = 1,035.11 × 663.32
  4. Step 4: Simplify right side
    689.58x = 686,613.41
  5. Step 5: Solve for x
    x = 686,613.41/689.58
  6. Step 6: Final answer
    x = 995.70

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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.