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Finding the Fourth Proportional to 811.24, 1,217.12 and 400.30

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Solution

The fourth proportional to 811.24, 1,217.12 and 400.30 is: 600.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.24 : 1,217.12 = 400.30 : x
  2. Step 2: Convert to fraction form
    811.24/1,217.12 = 400.30/x
  3. Step 3: Cross multiply
    811.24x = 1,217.12 × 400.30
  4. Step 4: Simplify right side
    811.24x = 487,213.14
  5. Step 5: Solve for x
    x = 487,213.14/811.24
  6. Step 6: Final answer
    x = 600.58

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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.