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Finding the Fourth Proportional to 691.56, 1,035.66 and 326.45

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Solution

The fourth proportional to 691.56, 1,035.66 and 326.45 is: 488.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.56 : 1,035.66 = 326.45 : x
  2. Step 2: Convert to fraction form
    691.56/1,035.66 = 326.45/x
  3. Step 3: Cross multiply
    691.56x = 1,035.66 × 326.45
  4. Step 4: Simplify right side
    691.56x = 338,091.21
  5. Step 5: Solve for x
    x = 338,091.21/691.56
  6. Step 6: Final answer
    x = 488.88

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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.