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Finding the Fourth Proportional to 931.55, 1,396.24 and 823.55

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Solution

The fourth proportional to 931.55, 1,396.24 and 823.55 is: 1,234.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.55 : 1,396.24 = 823.55 : x
  2. Step 2: Convert to fraction form
    931.55/1,396.24 = 823.55/x
  3. Step 3: Cross multiply
    931.55x = 1,396.24 × 823.55
  4. Step 4: Simplify right side
    931.55x = 1,149,864.41
  5. Step 5: Solve for x
    x = 1,149,864.41/931.55
  6. Step 6: Final answer
    x = 1,234.36

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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.